None
Governors of Steam Engines (continued) : Pickering's, 234 Porter's, 231 Their Stability, 232 Their Use, 23C Watt's, 231 With Crossed Arms, 234 Graphic Methods, see Electro-graphics and Dynamics Gravity, Acceleration of, 154 Gravity, Specific, Definition of, 153 Gresham and Craven's Steam Injector, 134 H. H, How to Determine, 294 H, Bottomley's Apparatus for Determining, 294 H, Effect of on a Tangent Galvanometer, 302 H, Ratio of Moment of Magnet to, 296 H and M, Determination of, 295 Heat : Adiabatic and Isothermal Expansion and Compression, 168 In Boilers, Sensible and Latent, 61 Boilers, Conduction Formula for, 163 Boiler Flues, Best Position for, 164 Boyle's or Mariotte's Law of Expansion of Gases, 163 Conduction, Formulas for, 163 Convection, Definition of, 164 Curve, An Adiabatic, 169 Cylinders, Conduction Formula for, 163 Cylinders, Expansion and Compression of Gases in, 1 68 Effect of on Permanent Magnets, 25 A Form of Energy, 161 Gases, Absolute Temperature of, 164 Gases, Expansion and Compression of, 168 Gases, Laws of Expansion of, 164 Gases, Imaginary and Actual, 165 Gases, Imaginary, Molecular Heat, 166 Gases, Imaginary, Specific Heat of, 166. 167 Gases, Imaginary) Thermodynamics of, 166 Gay-Lussac's Law of Expansion of Gases, 164 How Transferred, 162 Heat Engine, Carnot's, 170 Heat Engine, Definition of, 170 Heat Engine, Efficiency of, 172 Joule, and the Mechanical Equivalent of, 14, 165, 305, 339 Latent, Explanation of, 166 Mechanical Equivalent of, 14, 165, 305, 339 Non-conducting Materials, 163 Radiation, Definition of, 163 Sensible Heat, 166 Specific Heat, 162 Steam-pipes, Conduction Formula for, 163 Temperature, Definition of, 161 Temperature, Measurement of, 161 Thermo-dynamics, Theory of, 165 Units, 162, 305 Waste of in Boilers, 64 Heating of Conductors, Forbes's Experiments, 14 Heating of Conductors, Joule's Law for, 339 Heating Effect of Current, 13 Heating-surface of Boilers, 63, 66 Heating of Switches, How Guarded Against, 267 Hering's Formula? for Heating of Magnet Coils, 16 High-Speed Engines, see Engines Holden-d 'Arson val Galvanometer, 329 Hopkinson, Dr. His Work in Electro-graphics, 33 Hopkinson's Feed-valve for Boilers, 140 ; Steam-pipe Joint, 124 • Steam Check-valve, 127 : Steam Stop-valve, 125. Horizontal Boilers, see Boilers Horizontal Engines, see Engines Horse-power, Electrical, 14 H onn E " ] r? W f .' Mechanioal : its Equivalent in the Metric System 292; Explained, 14, 154, 292; Indicated and Actual, 204 ; Indi- cated, How to Determine, 202 Horseshoe Magnet (Permanent), Field of, 24 Hydrogen, Amount liberated by one ampere in one second, 17 Hydrogen and Oxygen Produced in Voltameter, 19 Impurities in Boilers, Getting Rid of, 121, 149, 150 Inclination or Dip, Measuring Angle of, 300 Incrustation in Boilers, CauBe and Prevention of, 121, 148 150 Indicated Horse-power and Actual, 204 ' Indicated Horse-power, How to Determine, 202 Indicator, Steam : Crosby's, 189 Darke's, 191 D H^ n „ ati0n £ A u 0U IV t 0f Steam Consumed per Indicated Horse-power Hour by Means of, 205 Indicator, Steam (continued) -. Description of, 186 Diagram, Theoretical, 238 Diagrams from Compound Engine, Combination of, 198 Diagrams, Ideal and Real, 196 Driving Gear for, 192 Driving Gear as used on " Globe " High-Speed Engines, 194 Mclnnes's, 192 Management of, 194 Maximum Pressures for Springs, 188 Musgrave and Sons' Driving Gear for, 193 Pantagraph Driving Gear for, 192 Richards's, 191 Tabor's, 187 Use of, 185 Inductive Action in the Magnetic Circuit, 26 Inductive Capacities, Specific, Table of, 32 Inductive Circuit, see Circuits Inductive Resistance, Specific, 31 Inertia of Magnetic Needle, Determination of Moment of, 296 Inertia, Moment of, 155, 295 Injection Condensers, Steam, 227 Injectors, Steam : Davies and Metcalfe's Exhaust Steam, 137 ; Principle of, 134 ; the Exhaust Steam, 137 ; Gresham and Craven's' 134 ; the Lifting, 137 ; the Non-lifting, 137 Installations, Plans of: Mentmore, 44, 45, 46; Edison's Brooklyn Station, Plates N and O. Insulation Resistance, Silvertown Testing Set for, 347, 349 Insulators, List of, 6 Insulators, Magnetic, 25 Insulators, Their Use and Properties, 6 Insulators for Electric Light Mains: Brooks's, 373; Callender- Webber, 363, 367 ; Calender's, 371 ; Crompton's, 358 ; Ferranti's, 380 Iron Filings, How Influenced by Wire Carrying Current, 12, 20 Isothermal Expansion and Compression, 168 Joints for Electric Light Mains : Calender's, 370 ; Crompton's. 353 361 ; Ferranti's, 380 Joule, The, £92, 305 Joule and the Mechanical Equivalent of Heat, 14, 163, 305, 339 Joule's Law for Heating of Conductors, 339 Journals of Engines, 224 Junction-eoxes FOR Electric Light Mains : Brooks's, 374 ; Calender's, 370; Callender-Webber, 367; Crompton's, 355: Ferranti's, 384 K. K, Table of Values of, 295 Kilogrammetres and Foot-pounds, 14 Kinetic Energy, Definition of, 155 Kirchoffs Current Laws, 11 Kirchoffs Slide-wire Bridge, 307 Kirkaldy's Feed-water Heater, 142 Lancashire Boilers, see Boilers Lead in Engines, Explanation of, 242 Leakage, Magnetic, 25 Leeds Forge Company's Boilers, 84, 87 Length, Unit of, 153 Leyden Jars, Description of, 32 Lines and Loops of Force, see Force Locomotive Boilers, see Boilers London Electric Supply Corporation's Mains, Method of Laying, 380 Low- Water Alarms for Boilers, 120 Lubricators for Engines : Crosby's Visible Drop-Feed, 245 Dewrance's Window Form, 248 Use of, 245 Winn's Sight-Feed, 248 M M divided by H, Determination of Ratio, 296 M H, Determination of, 295 Machine, Calculating Efficiency of, 160 M'Neil's Boiler Manhole, 112 Magnet : Magnetic Moment of, 294 ; Measuring Magnetic Moments of, 299 ; Ratio of Moment of to H, 296 ; a Perfect, 23 ; Short, Relation of Forces Acting on with Coils of Different Radii, 303 Magnets: Comparing Magnetic Moments of, 299; Effect of Earth's Magnetism on, 293; for Meters, 342; Properties of, 23; .i,e Electromagnets and Permanent Magnets Magnetic Circuit, see Circuits Magnetic Conductivity and Resistance, 25 Magnetic Declination, or Dip, 293 INDEX. Vll. Magnetic Dip, Measuring Angle of, 300 Magnetic Field : Dae to Leakage, 25 The, Illustrated, 23 of Bar and Horseshoe Magnets, 24 Measuring the Strength of, 298 Magnetic Fields : And Conductors, Interaction between, 27 ; Inter- actions between, 25 ; of Conductors, 23 Magnetic Insulators, 25 Magnetic Lines and Loops of Force, see Fobce Magnetic Meridian, Determination of, 293 Magnetic Meridian and the Tangent Galvanometer, 302 Magnetic Pressure, 25 Magnetism, may be Electricity in Motion, 23 Magnetism of Earth : Determination of Horizontal Component of, 294 ; Effect of H on Tangent Galvanometer, 302 ; Its Effect on Magnets, 293 ; Determination of M H, 295 Magnetism, Residual, 227 Magnetometer, How Used, 296 Mance's Method of Measuring Battery Resistance, 330 Mains, Electric Light : Contact Fault, How to Localise, 352 Earth, How to Localise, 351 Joint-Testing, 351 Methods of Laying : Crompton's System, 353 Callender-Webber System, 361 Callender Solid System, 367 Brooks's System, 373 Ferranti's, 380 Silvertown, Testing Set for, 344 Testing, 341, 34* Testing Conductor Resistance, 345 Testing. How to Carry it Out, 349 Testing Insulation Resistance, 347, 349 Manholes and Mudholes of Boilers, Their Construction, 112 Marine Boilers, see Boilers Masonry, Stability of, 54 Mass, Definition of, 153, 291 Mass, Units of, 153, 292 Mass and Weight, Difference between, 291 Matthiessen's Table of Conductivities, 8 Measurement of Electrical Quantities : Ammeters, Ayrton and Perry's, 341 Ammeters, Paterson and Cooper's, 342 Ammeters, Permanent v. Electromagnets for, 34<i Ampere, The Absolute, 305 Ampere Balances, Thomson's, 316 Ampere Gauge, Thomson's, 323 Ampere-meter, Thomson's Magnetostatic, 5^1 Ayrton and Perry's Ammeters and Voltmeters, 341 Balance, Composite, Thomson's, 319 Balances, Electric, Thomson's, 316 Balances, Electrostatic, Thomson's, 323, 3^6. W h M t«tonp Battery and Galvanometer, Their Position in the Wheatstone Bridge. Figure of Merit, How to Calculate, 311 The Holden-d'Arsonval, 329 , g for Measuring Resistances by Fall of IWuie, 339 Measurement of Electrical Quantities (continued) : Galvanometer : for Measuring Capacity, 336 for Measuring Battery Resistance, 329 for Measuring Pressure, 332 a Portable, 344 Its Use in the Wheatstone Bridge, 306 Mirror, How to Make, 3C8, 310 ; Resistance, Measurement of, 313 Shunts, How to Make, 309 ; of the Silvertown Portable Testing Set, 344 Tangent : Description of, 301 ; How to Calculate Effect of H on, 302 ; How to Make, 303 ; How to Use, 303 ; Deter- mining Reduction Factor of, 311 ; Principle of, 301 ; Principle of Adopted in most Meters, 316 Glazebrook and Shaw's Method of Measuring Capacity, 337 Glazebrook and Shaw's Method of Measuring Pressure, 335 Gravity, Its Effect on Weight, 291 H, How to Determine, 294 H, Bottomley's Apparatus for Determining, 294 Heat, Mechanical Equivalent of, 339 Heating of Conductors, Experimental Apparatus for Verifying Joule's Law, 340 Heating of Conductors, Joule's Law for, 339 Horse-power, Its Equivalent in the Metric System, 292 Horse-power, Unit of, 292 Inclination, or Dip, Measuring Angle of, 300 Inertia, Moment of, Tables of Value of, 295 Insulation Resistance, Measurement of, 347 Insulation Resistance, Silvertown Portable Testing Set for Measuring, 347 Joule, The, 292, 305 Joule's Law for Heating of Conductors, 339 Joule's Law, Experimental Apparatus for Verifying, 340 K, Table of Values of, 295 Kirchoff's Slide-wire Bridge, 307 Loop Test for Localising Earth, 351 Loops of Force, Effect of Increase or Decrease in a Given Area, 304 M H, Determination of, 295 M/H, Determination of Ratio of, 296 Magnet, Magnetic Moment of, 294 Magnet, Measuring Magnetic Moment of, 299 Magnet, Ratio of Moment of to H, 296 Magnet, Short, Relation of Forces Acting on with Coils ol Different Radii, 303 Magnets, Comparing Magnetic Moments of, 299 Magnetic Declination, or Dip, 293 Magnetic Dip, Measuring Angle of, 300 Magnetic Field, Measuring the Strength of, 298 Magnetic Meridian, Determination of, 293 Magnetic Meridian, The, and the Tangent Galvanometer, 30J Magnetic Needle, Determination of its Moment of Inertia, 296 Magnetometer, How Used, 296 Magnetostatic Current Meter, Thomson's, 321 Mass and Weight, Difference between, 291 Mass, Standards of, 292 Moment of Inertia, Table of Values of, 295 Multicellular Voltmeter, Thomson's, 323 Ohm, The Absolute, 304 Ohm's Law, Experimental Verifications of, 313 Paterson and Cooper's Ammeter, 342 Poggendorf's Method of Measuring Pressure, 334 Potential, see Pressure below Poundal, The, 292 Power, Definition of Unit of, 305 Poynting's Experiments on a Short Magnet and Coils of Different Radii, 303 Pressure, Absolute Unit of, 304 Pressure, Measuring Resistances by h all ot, 33B Pressure, Methods of Measuring, 331 Quantity, Definition of Unit of, 305 Resistance, Absolute Unit of, 304 Resistance Coils for Wheatstone Bridge, 308 Resistance of Conductors, Silvertown Testmg Set for Measuring, 345 Besistances, Measurement of by Fall of Pressure, 338 of Resistances by Wheatstone Bridge Method. Index. Measurement of Electrical Quantities (continued) : Volt and Watt Balance, Thomson's, 319 Watt, Definition of, 305 Wheatstone's Standard Cell, 331 Wheatstone Bridge Method, 305 Wiieatstone Bridge : Method of Measuring Galvanometer Resistance, 313 Cheap Form Wanted for Engineering Work, 328 for Measuring Battery Resistance, 329 for Measuring Capacity, 336 for Measuring Pressure, 332 as Used in the Silvertown Portable Testing Set, 346 Post Office Form of, 305 Slide-wire Form of, 307 Wiedemann's Method of Measuring Pressure, 333 Work or Heat, Definition of Unit of, 305 Work of B.A Committee in, 291 Mechanical Energy, Kinds of, 155 Mechanical Equivalent of Heat, 14, 165, 305, 339 Mentmore Installation, Plans of, 44, 45, 46 Meridian, Magnetic, Determination of, 293 Metals : Are Conductors, 6 ; Conductivities of Various, 8 ; Fusi- bility of, Preece's Tables, 17 ; Resistance of Various, 11 ; Effect of Temperature on Resistance of, 8 Meters, sea also Measurement Current : Ayrton and Perry's, 341 Calibration of, 341 Linesman's Detector, 344 Paterson and Cooper's, 342 Permanent and Electromagnets for, 342 Thomson's Ampere Gauge, 323 Thomson's Balances, 316 Thomson's M agnetostatic, 321 Pressure : Ayrton and Perry's, 341 Calibration of, 343 Cardew's, 343 Pocket, 343 Thomson's Electrostatic, 323 Thomson's Engine-room, 327 Thomson's Multicellular, 319 Meyer's Slide-valve, 243 Molecular Heat, 166 Moment of Forces, 36 Moment of Inertia, 155, 295 Mirror Galvanometer, How to Make, 308, 310 Moment of Inertia of Magnetic Needle, Determination of, 296 Moments of Magnet, Measurement of, 29J Moments of Magnets, Comparing, 299 Mortar for Use in Foundations, 59 Motion, Definition of, 154 Multicellular Voltmeter, Sir William Thomson's, 323 Multiple Arc or Parallel Circuits, 10 Multitubular Boilers, see Boilers Mumford's Donkey Pump, 131 Musgrave's Barring Engine, 249 Musgrave's Boiler, Description of, 70, 95 ; Calorimeter, 206 ; Feed- water Heater, 144 ; Injection Condenser, 227 ; Surface Condenser, 229 N. New York Station, Edison's, see Plates N and O Non-conducting Materials for Boilers, 163 Non-conductors, see Insulators o. Ohm : The Unit of Resistance, 7, 9 ; the B.A. and the Legal Ohm 7 • Determination of the Absolute, 304 Ohm's Law, Explanation of, 9 Ohm's Law, Experimental Verification of, 313 Ohm's, Amperes and Volts, Their Relation, 304 Oiling Engines, see Lubricators Opera House, Royal English, Switchboard used at, 286 P. Parabolic Engine Governor, The, 233 Paterson and Cooper's Ammeters, 342 ''mTilSZc^L 2 ^ Crank8haft ' 22l! En ^ ine G ~- Permanent Magnets, Description of, 24 Permanent Magnets, Effect of Heat on, 25 Permanent and Electromagnets for Meters, 342 Pickering's Engine Governor, 234 Pin, Cross-head, Diameter of, 224 Pins, Crank, Diameter of, 224 Pistons of Steam Engines : Construction of, 211 Cross-heads for, Object and Construction of, 215 Paxman and Co.'s, 211 Paxman's Cross-heads, 215 Position of, During' One Revolution, 242 Robey and Co.'s, 212 Robey's Cross-heads, 216 Rods for. How to Calculate Strength of, 213 Speed of, and Fywheel Diagrams, 239 Speed of, How do Calculate, 213 ' Plane Figures, Determination of Areas of, 157 Planimeter, Use of, 153 ; Amsler's Polar, 158 ; the Coffin, 159 PoggendorfFs Method of Measuring Pressure, 334 Poles, Magnetic Description of, 23 Poles, Magnetic, Interaction of, 26 Poles, Magnetic, of the Earth, Movements of, 302 Poole and White's Switchboard, 289 Portable Galvanometers, 344 Portable Testing Sets, 344 Porter's Engine Governor, 231 Ports, Steam, Use and Work of, 241 Positive and Negative Pressure, 29 Post Office Form of Wheatstone Bridge, 305 Post Office Installation : Switchboard used in, 268, 291 ; Switches used in, 217 Potential, see Pressure. Potential Energy, Definition of, 155 Poundal, The, 292 Power, Definition of, 154 Power, Unit of, 154, 305 Poynting's Experiments on a Short Magnet and Coils of Different Radii, 303 Preece's Fusibility Tables, 17 Pressure in Boilers, Absolute and Effective, 61 Pressure Gauges for Boilers, 114 Pressure and Volume, 156 Pressure, Electrical : Clarke's Method of Measuring, 334 in the Conductive Circuit, 6 . Current and Resistance, Their Relation, 304 Daniell's Cell as a Standard of, 331 Electricity moved by, 5 Galvanometers as used for Measuring, 332 Glazebrook and Shaw's Method of Measuring, 335 Graphic Method of Representing, 40 How it Acts, 12 in the Inductive Circuit, 28 in the Magnetic Circuit, 25 Measurement of Resistances by Fall of, 338 Methods of Measuring, 331 Meters, see under Voltmeters, Meters, and Measurement Ohm's, Law for, 9 PoggendorfFs Method of Measuring, 334 Positive and Negative, 29 Production of, Water Analogy. 5 Unit of, 9 Absolute Unit of 304 Wheatstone's Method of Measuring, 373 Wheatstone's Standard Electromotive Force Cell, 331 Wheatstone's Bridge for Measuring, 332 Wiedemann's Method of Measuring, 334 Priming in Boilers, The Anti-Priming Pipe, 129 Pumps, Boiler, see also Injectors Use of, 130 Garrett and Sons, Feed, 131 Mumford's Donkey, 131 Q- Quantity, Unit of, 31, 305 Quantity, Graphical Representation of a Single, 35 Quick-Speed Engines, see Engines R. Radiation, Definition of, 163 Ransome, Sims, and Jefferies' Boiler, 1C1 Rayleigh's Experiments on the Deposition of Silver, 17 Reciprocating Motion in Steam Engines, Laws of, 239 Resistance Coils for Wheatstone Bridge, 308 Resistance and Effort, Mechanical, 153, 156 Resistance, Electrical : of Alloys, 9 of Batteries. Measurement of, 329 of Branch Circuits, 11 of Conductive Circuit, What it is, 6 and Conductivity, Their Relations, 7 of Conductor, Increased by Interference with Field, 22 of Conductors, Influenced bv l.i>n<-rt.h qml sUw>u,>„„i 'a..,,., <7 INDEX. IX. Resistance, Electrical (continued) : of Conductors, Silverbown Testing Set for, 345 Current and Pressure, Relation of, 304 Effect of Annealing on, 9 Effect of Temperature on, 8 of Galvanometers, Measurement of, 313 How Affected by Shunt Circuits, 10 of Inductive Circuit, How Calculated, 29 of Insulation, Silvertown Testing Set for, 347, 349 Internal and External, How Calculated, 10 ■ Magnetic, 25 of Magnetic Circuit, How Lessened, 26 Its Measurement by Fall of Pressure, 338 Ohm's Law for, 9 Specific, 7 Specific Inductive, 31 Unit of, The Ohm, 7, 302 of Various Metals, 11 Wheatstone Bridge Method of Measuring, 305 Residual Magnetism, 27 Rhode's Steam Stop-valye, 125 Riveting and Jointing Boiler Shells, 102 Roads and Streets, Methods of Laying Electric Light Mains Under, BnW's Boilers, 77 ; Compound Engine Bearings, 223 ; Connecting-, rod! 217?F«l-wJtar Heaters, 143; Steam Stop-valve, 125; Com- pound Engine, 260 Rocks, Characteristics of Various, 49 Rosebery, Lord, Plans of Installation at his Mansion, Mentmore, 44, Ro^alEnglish Opera House InstaUation, Switchboard used in, 286 s. Safety-valves for Boilers: Board of Trade Rules for, 119 Construction of, 115 Dead-Weight, 115 Double-Lever, 117 Galloway's, 115 Hopkinson's Compound, 11/ How to Calculate Size of Opening, 119 How to Find Working Pressure, 117 Ramsbottom's, 117 Relief -valves, 117. Rule for Calculating Size of Springy, 120 Rules for Construction of Valve, 119 Spring, 116 Scale in Boilers, Cause and Prevention of, 121, 149, 150 Schaffer's Steam Pressure Gauge, 115 Scum in Boilers, Getting Rid of, Hi Secondary Batteries, see Batteries, Secondary Sna/Area of Conductors, Its Effect on Resistance, 7 Shafts and Journals of Engines, Diameter of, lib Shells of Boilers, Calculating Strength of, 108 Short Circuits, 31 Shunt Circuits, 10 Shunt Winding Explained, 10 Shunts for Galvanometers, How to Make, 3Ub Sight-Feed Lubricators, see Lubricators „ p „ nntl 17 Silver, Amount Deposited by One Ampere in One Second, 17 Silvertown Portable Testing Set, 544 Sines and Cosines, Table of, 35 Sines, Curve of, 34 Site of Central Station, Requisites, 43 Slide-valves, see Valves, Slide Soils, Characteristics of Various, 4y Soils, Safe Bearing Power of, 59 Solenoid, Illustration of a, 23 Specific Gravity, Definition of, loo Specific Heat, 162 ,_ Specific Heat of Imaginary Gases, 166 167 Specific Inductive Capacities, Table 01, o<S Specific Inductive Resistance, 31 Specific Resistance, What it us, 7 Specific Volume, Definition of, lbo Springs for Switches, Use of, 266 Starting Engines, 249 Stays for Boilers, 109 Steam : Analysing its Wetness, 2T6 Leakaae and Condensation, 205 Calculation of Losses in Engme by Leakage an Horse -power Determination of Amount Consumed per Indicatea Hour, 205 Dry and Superheated, 61 How it Behaves in a Cylinder, \l£ Hyperbolic Expansion of, 179 Losses in Engines, 207 Steam Boilers, see Boilers Steam Check- valves for Boilers: Use of, 127 Hopkinson's, 127 Steam Engine, see Engines Steam Indicator : Crosby's, 189 Darke's, 191 Description of, 186 Determination of Amount of Steam Consumed per Indicated Horse-power Hour by means of, 205 Diagrams, An Ideal and Real, 196 Digrams from Compound Engines, Combination of, 198 Driving Gear for, 192 Driving Gear as used on " Globe " High-Speed Engines, 194 Mclnnes's, 192 Management of, 194 Maximum Pressures for Springs, 188 Musgrave and Sons' Driving Gear, 193 Pantagraph Driving Gear for, 192 Richards's, 191 Tabor's, 187 Use of, 185 Steam Injector : Davies and Metcalfe's Exhaust Steam, 137 The Exhaust Steam, 137 Gresham and Craven's, 134 The Lifting, 137 The Non-lifting, 137 Principle of, 134 Steam-pipe Joints and Fittings, 124 Steam Pressure Gauges for Boilers, 114 Steam-ports, Use and Work of, 241 , .,. Steam-reducing Valves for Boilers : Use of, 130 ; Dewrance s, 1AU Steam Separators for Boilers : Use of, 128 ; Hydes and Y\ igfull s, 129 ; Musgrave and Son's, 129 ; Savill's, 130 Steam-trap in Cylinders, Use of, 210 Steam -valves for Boilers : Dewrance's Renewable, 126 Hopkinson's, 125 Rhodes's, 125 Robey's, 125 Use and Construction of, 125 Stones as Building Materials, 55 Strata for Foundations, Testing, 48 M . T ^« Streets, Methods of Laying Electric Light Mains Under, see Mains Sturgeon, Maker of First Electromagnet, 24 Swinburne on the want of Practical and Cheap Measuring Apparatus, 328 Switches : Arcing to be Avoided, 265 Brush Company's High and Low Pressure, 289 Contacts, Methods of Ensuring Good, 268 Bases for, 268 with Double and Multiple Contacts, <i68 with Ring Contacts, 268 with Wedge Contacts, 268 Designing, Points to be Observed, 267 Drake and Gorham's, Four-way, 278 Heating of, How Guarded Against, 267 Best Material for, 267 Object of, is65 Post Office Switches, Details of, 277 Quick Action a Necessity, 265 Single and Double Pole, Principle of, 265, 268 Use°of Springs, 266 SW Tus°h A C D ompany's High and Low Pressure Board, 289 Crompton and Co.'s Boards, 278 Cut-outs for, 289 Drake and Gorham's Accumulator Board, 278 General Electric Company's Board, AM Object of, 278 Poole and White's Board, 289 Post Office Board, 286, 291 in Use at Madame Tussaud s, 289 in Use at Royal English Opera House, 286 T. Tangent Galvanometer, see Galvanometers and Measurement S^l2^Sg£S^^U«I of Testing, 3C6 ?Stinf Set, The Silvertown, 344 TVstine Sets, Portable, 344 Stin| Wheatstone Bridge Method, 3C5 Thermal Units, etc., see Heat Thermodynamics, Theory of, 165 ikDEX. Thermo dynamics of Imaginary Gases, 166 Temperature : Its Effect on Resistance, 8 ; Definition of, 161 ; Measurement of, 161 ; of Gases, absolute, 164 ; Changes of in an Engine Cylinder, 176. Thompson, Silvanus, His Work in Electro-graphics, 37 Thomson, Sir William : His Method of Measuring Battery Resistance, 330 His Method of Measuring Capacity, 337 His Method of Measuring Galvanometer Resistance, 315 His Meters : Ampere Balances, 316 Ampere Gauge, 323 Composite Balance, 319 Electrostatic Balances, 323, 326 Electrostatic Voltmeters, 323 Engine-room Voltmeters, 327 Magnetostatic Current Meter, 321 Marine Voltmeter, 319 Multicellular Voltmeter, 323 Throttle-valve, see Valve, Throttle Time, Unit of, 153 Torque, Explanation of, 37 Tubes for Boilers, Construction of, 110 Tubular Boilers, see Boilers] Tussaud's, Madame, Switchboard Used at, 289 u. Underfooting Foundations, 51 Underground Mains, Methods of Laying, see Mains Unit Current, Definition of, 302 Units for Comparing Phenomena of Circuits, 7 Units, Various : B.A. Committee's Work on 291 The B.A. and the Legal Ohm, 7 C.G.S. System, 7, 291 of Current, 9, 302 Dynamical, 292 of Force, 15, 3 Fundamental and Derived, 292 u r Meat, 14, 162, 305 of Length, 153 of Mass, 153 The Ohm, 7, 304 of Power, 154, 305 of Pressure, 9, 304 of Quantity and Capacity, 31, 305 of Resistance, 7, 304 Thermal, 14, 162, 305 of Time, 153 of Velocity, 154 The Volt. 9, 304 of Work, 13, 154 V. Valve, Blow-off for Boilers, Hopkinson's, 122 Valve, Throttle, Description of, 237 Valves, Feed, for Boilers : Use of, 139 Ferranti's, 140 Hopkinson's, 140 Renewable, 140 Valves, Safety, for Boilers : Board of Trade Rules for, 119 Construction of, 115 Dead- Weight, 115 Double-Lever, 117 Galloway's, 115 Hopkinson's Compound, 117 How to Calculate Size of Opening, 119 How to Find Working Pressure, 117 Ramsbottom's, 117 Relief- valves, 117 Rule for Calculating Size of Springs, 120 Rules for Construction of Valve, 119 Spring, 116 Valves, Slide, of Steam Engines : Description of, 240 Meyer's 243 Paxman's, 243 and Ports, Detailed Explanation of Work of, 241 Relation of Eccentric to, 239 Use of, 239 Zeuner's Diagram, 240 Valves, Steam, for Boilers : Use and Construction of, 125 Dewrance'B Renewable, 126 Hopkinson's, 125 Rhodes's, 125 Robey'e, 125 Valves, Steam Check, for Boilers : Use of, 127 ; Hopkinson's, 127 Valves, Steam-Reducing, for Boilers : The Use of, 130 ; Dewrance's 130 Valencies, Table of, 19 Velocity, Definition of, 154 Velocity, Unit of, 154 Vertical Boilers, see Boilers Volt, The Absolute, 304 Volt, The Unit of Pressure, 9 Volts, Amperes and Ohms, Their Relation, 304 Voltameter, Construction of, 19 Voltmeters, see also Measurement Ayrton and Perry's, 341 Calibration of, 343 Cardew's, 343 Pocket, 343 Thomson's Composite, 319 Thomson's Electrostatic, 323 Thomson's Engine-room, 327 Thomson's Marine, 319 Thomson's Multicellular, 323 Volume and Pressure, 156 Volume, Specific, Definition of, 153 w. Walls, Construction of, 57 Water Analogy as an Explanation of Current Flow, 12 Water Gauge for Boilers, Dewrance's, 113 Water, Heat Required to Evaporate it, 61 Water-level Indicators for Boilers, 113 Water Supply oe Boilers : Chemical Composition of, 148 Compositions for Preventing Scale, 150 Davies and Metcalfe's Exhaust Steam Injector, 137 Feed-pipe and Feed-valves, 139 Feed-water, Fuel Saved by Heating, 141 Feed-water, Heating of, 141 Garrett's Feed Pump, 131 Garrett and Son's Feed-water Heater, 141 Gresham and Craven's Injector, 134 How Kept Up and Regulated, 130 Kirkaldy's Feed-water Heater, 142 Mumford's Donkey Pump, 131 Musgrave and Son's Feed-water Heater, 144 Robey and Co.'s Feed-water Heater, 143 Steam Injector, Principle of, 134 Steam Injector, Exhaust, 137 Steam Injector, Lifting, 137 Steam Injector, Non-lifting, 137 Watt, Electrical Unit of Work, 14, 305 Watt's Engine Governor, 231 Webber and Calender's Method of Laying Electric Light Mains, 361 Weight, its Relation to Mass, 154 Wbeatstone's Method of Measuring Pressure 333 Wheatstone's Standard Cell, 331 Wiieatstone Bridge : Cheap Form Wanted for Engineering Work, 328 Kirchoff's Slide- wire Form, 307 Method of Using, 305 Measuring Resistances by, 305 for Measuring Battery Resistance, 329 for Measuring Capacity, 338 for Measuring Galvanometer Resistance, 313 for Measuring Insulation Resistance, 347 for Measuring Potential or Pressure, 332 Post Office, Form of, 305 Resistance Coils for, 308 As used in the Silvertown Testing Set, 346 Wiedemann's Method of Measuring Pressure, 333 Windsor Engine, The, 264 j. Winn's Sight-Feed Lubricator, 248 Wire Carrying Current, Phenomena Connected with, 12 Wires, see also Conductors Wires, Conductivities of Hard-drawn and Annealed, 9 W r lre ,'l;: U ndel 'S round > Method of Laying, see Mains Woolf's Compound Engine, 177, 182 W ork : Electrical, Unit of, 14, 305 Definition of; 154 In Terms of Pressure and Volume, 156 Mechanical, Unit of, 13 Unit of, 154 Representation of, by an Area, 156 Useful and Waste, 160 z. Zeuner's Slide-valve Diagram, 240. 