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20 502 ENGINEER'S HANDY-BOOK. CONTAINING FACTS, FORMULAE, TABLES AND QUESTIONS ON POWER, ITS GENERATION, TRANSMISSION AND MEASUREMENT; HEAT, FUEL AND STEAM ; THE STEAM-BOILER AND ACCESSORIES ; STEAM-ENGINES AND THEIR PARTS ; THE STEAM-ENGINE IN- DICATOR; GAS AND GASOLINE ENGINES; MATERIALS, THEIR PROPERTIES AND STRENGTH: TOGETHER WITH A DISCUSSION OF THE FUNDAMENTAL EXPERIMENTS IN ELECTRICITY, AND AN EXPLANATION OF DYNAMOS, MOTORS, BATTERIES, SWITCHBOARDS, TELE- PHONES, BELLS, ANNUNCIATORS, ALARMS, Etc., AND ALSO RULES FOR CALCULATING SIZES OF WIRES. BY STEPHEN EOPEK, Engineer, AUTHOR OF " Roper's Catechism of High-Pressure or Non-Condensing Steam-Engines," '* Roper's Hand-Book of the Locomotive," "Roper's Hand-Book of Land and Marine Engines," "Roper's Hand-Book of Modern Steam-Fire Engines," " Young Engineer's Own Book," "Use and Abuse of the Steam-Boiler," "Ques- tions and Answers for Engineers," etc. FIFTEENTH EDITION. REVISED AND GREATLY ENLARGED BY EDWIN R. KELLER, M. E., AND CLAYTON W. PIKE,B. S., Ex-President of the Electrical Section of the Franklin Institute. PHILADELPHIA : DAVID McKAY, 1022 Market Street. 1903. PRICE, POSTPAID, p.50. SEND FOR CIRCULARS. FEB 10 1905 ROPER'S QUESTIONS AND ANSWERS FOR STATIONARY AND MARINE ENGINEERS AND ELECTRICIANS WITH A CHAPTER ON WHAT TO DO IN CASE OF ACCIDENTS ^ixth (BAxtion, '^txvxitUn Hud (^xtMti Enlarged by EDWIN R. KELLER, M.E. AND CLAYTON W. PIKE, B.S. Ex-President of the Electrical Section of the Franklin Institute PHILADELPHIA DAVID McKAY, Publisher, 1022 Market Street PRICE, POSTPAID, p. 00. SEND FOR CIRCULARS. ROPER^S Practical Hand -Books For Engineers and Firemen. NEW REVISED AND ENLARGED EDITION. HANDY-BOOK FOR STEAM ENGINEERS AND ELECTRICIANS. PRICE, $3.50. PRICE. Rqper's Catechism for Steam Engineers and Electric- ians, $2*00 Roper^s Questions and Answers for Steam Engineers and Electricians, . 2.00 Roper^s Hand-Book of Land and Marine Engines, • 3»50 Roper^s Care and Management of the Steam Boiler, 2M Roper^s Use and Abuse of the Steam Boiler, . . . . 2.00 Roper^s Young Engineers^ Own Book, 2»50 Roper^s Hand-Book of the Locomotive, 2»50 Roper^s Instructions and Suggestions for Engineers and Firemen, 2.00 Roper^s Hand-Book of Modem Steam Fire Engines, . 3.50 DAVID MCKAY, Publisher, J022 Market Street, Philadelphia, Pa. Complete Descriptive Circulars Mailed Free on Application, Send for them. 