title: Library of Congress Classification:Class T -- Technology
text: # Library of Congress Classification:Class T -- Technology
  
  Class T: Technology is a classification used by the Library of Congress Classification system. This page outlines the subclasses of Class T.
  
  ## T - Technology (general)
  
      10.5-11.9...................................Communication of technical information
      11.95-12.5.................................Industrial directories
         55-55.3............................................Industrial safety. Industrial accident prevention
      55.4-60.8...................................Industrial engineering. Management engineering
         57-57.97..........................................Applied mathematics. Quantitative methods
            57.6-57.97.............................................Operations research. Systems analysis
         58.4................................................Managerial control systems
         58.5-58.64.......................................Information technology
         58.6-58.62.......................................Management information systems
         58.7-58.8.........................................Production capacity. Manufacturing capacity
         59-59.2............................................Standardization
         59.5................................................Automation
         59.7-59.77.......................................Human engineering in industry. Man-machine systems
         60-60.8............................................Work measurement. Methods engineering
      61-173.......................................Technical Education. Technical schools
      173.2-174.5...............................Technological change
      175-178.....................................Industrial research. Research and development
      201-342.....................................Patents. Trademarks
      351-385.....................................Mechanical drawing. Engineering graphics
      391-995.....................................Exhibitions. Trade shows. World's fairs
  
  ## TA - Engineering (general). Civil engineering
  
      164..........................................Bioengineering
      165..........................................Engineering instruments, meters, etc. Industrial instrumentation
      166-167...................................Human engineering
      168..........................................Systems engineering
      170-171...................................Environmental engineering
      174..........................................Engineering design
      177.4-185................................Engineering economy
      190-194...................................Management of engineering works
      197-198...................................Engineering meteorology
      213-215...................................Engineering machinery, tools, and implements
      329-348...................................Engineering mathematics. Engineering analysis
      349-359...................................Mechanics of engineering. Applied mechanics
      365-367...................................Acoustics in engineering. Acoustical engineering
      401-492...................................Materials of engineering and construction. Mechanics of materials
      495..........................................Disasters and engineering
      501-625...................................Surveying
      630-695...................................Structural engineering (General)
      703-712...................................Engineering geology. Rock mechanics. Soil mechanics. Underground construction
      715-787...................................Earthwork. Foundations
      800-820...................................Tunneling. Tunnels
      1001-1280...............................Transportation engineering
      1501-1820...............................Applied optics. Photonics
      2001-2040...............................Plasma engineering. Applied plasma dynamics
  
  ## TC - Hydraulic engineering. Ocean engineering
  
      1-978.................................Hydraulic engineering
         160-181...................................Technical hydraulics
         183-201...................................General preliminary operations. Dredging. Submarine building
         203-380...................................Harbors and coast protective works. Coastal engineering. Lighthouses
         401-506...................................River, lake, and water-supply engineering (General)
         530-537...................................River protective works. Regulation. Flood control
         540-558...................................Dams. Barrages
         601-791...................................Canals and inland navigation. Waterways
         801-978...................................Irrigation engineering. Reclamation of wasteland. Drainage
      1501-1800.........................Ocean engineering
  
  ## TD - Environmental technology. Sanitary engineering
  
      159-168...................................Municipal engineering
      169-171.8................................Environmental protection
      172-193.5................................Environmental pollution
      194-195...................................Environmental effects of industries and plants
      201-500...................................Water supply for domestic and industrial purposes
         419-428.........................................Water pollution
         429.5-480.7..................................Water purification. Water treatment and conditioning. Saline water conversion
         481-493.........................................Water distribution systems
      511-780...................................Sewage collection and disposal systems. Sewerage
      783-812.5................................Municipal refuse. Solid wastes
      813-870...................................Street cleaning. Litter and its removal
      878-894...................................Special types of environment. Including soil pollution, air pollution, noise pollution
      895-899...................................Industrial and factory sanitation
         896-899.........................................Industrial and factory wastes
      920-934...................................Rural and farm sanitary engineering
      940-949...................................Low temperature sanitary engineering
      1020-1066...............................Hazardous substances and their disposal
  
  ## TE - Highway engineering. Roads and pavements
  
      175-176.5................................Highway design. Interchanges and intersections
      177-178.8................................Roadside development. Landscaping
      200-205...................................Materials for roadmaking
      206-209.5................................Location engineering
      210-228.3................................Construction details. Including foundations, maintenance, equipment
      250-278.8................................Pavements and paved roads
      279..........................................Streets
      279.5-298................................Pedestrian facilities
         280-295.........................................Sidewalks. Footpaths. Flagging
         298................................................Curbs. Curbstones
  
  ## TF - Railroad engineering and operation
  
      200-320...................................Railway construction
      340-499...................................Railway equipment and supplies
      501-668...................................Railway operation and management
      670-851...................................Local and light railways
         840-851.........................................Elevated railways and subways
      855-1127.................................Electric railways
      1300-1620................................High speed ground transportation
  
  ## TG - Bridge engineering
  
      1-470................................Bridge engineering
  
  ## TH - Building construction
  
      845-895...................................Architectural engineering. Structural engineering of buildings
      900-915...................................Construction equipment in building
      1000-1725...............................Systems of building construction. Including fireproof construction, concrete construction
      2025-3000...............................Details in building design and construction. Including walls, roofs
      3301-3411...............................Maintenance and repair
      4021-4977...............................Buildings: Construction with reference to use. Including public buildings, dwellings
      5011-5701...............................Construction by phase of the work (Building trades)
      6014-6081...............................Environmental engineering of buildings. Sanitary engineering of buildings
      6101-6887...............................Plumbing and pipefitting
      7005-7699...............................Heating and ventilation. Air conditioning
      7700-7975...............................Illumination. Lighting
      8001-8581...............................Decoration and decorative furnishings
      9025-9745...............................Protection of buildings. Including protection from dampness, fire, burglary
  
  ## TJ - Mechanical engineering and machinery
  
      163.13-163.25..........................Power resources
      163.26-163.5............................Energy conservation
      170-179...................................Mechanics applied to machinery. Dynamics
      181-210...................................Mechanical movements
      210.2-211.47............................Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
      212-225...................................Control engineering systems. Automatic machinery (General)
      227-240...................................Machine design and drawing
      241-254.7................................Machine construction (General)
      255-265...................................Heat engines
      266-267.5................................Turbines. Turbomachines (General)
      268-740...................................Steam engineering
         603-695.........................................Locomotives
      751-805...................................Miscellaneous motors and engines. Including gas, gasoline, diesel engines
      807-830...................................Renewable energy sources
      836-927...................................Hydraulic machinery
      940-940.5................................Vacuum technology
      950-1030..................................Pneumatic machinery
      1040-1119................................Machinery exclusive of prime movers
      1125-1345................................Machine shops and machine shop practice
      1350-1418................................Hoisting and conveying machinery
      1425-1475................................Lifting and pressing machinery
      1480-1496................................Agricultural machinery. Farm machinery
      1501-1519................................Sewing machines
  
  ## TK - Electrical engineering. Electronics. Nuclear engineering
  
      301-399...................................Electric meters
      452-454.4................................Electric apparatus and materials. Electric circuits. Electric networks
      1001-1841...............................Production of electric energy or power. Powerplants. Central stations
      2000-2891...............................Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
      2896-2985...............................Production of electricity by direct energy conversion
      3001-3521...............................Distribution or transmission of electric power
      4001-4102...............................Applications of electric power
      4125-4399...............................Electric lighting
      4601-4661...............................Electric heating
      5101-6720...............................Telecommunication. Including telegraphy, telephone, radio, radar, television
      7800-8360...............................Electronics
         7885-7895.....................................Computer engineering. Computer hardware
         8300-8360.....................................Photoelectronic devices (General)
      9001-9401...............................Nuclear engineering. Atomic power
      9900-9971...............................Electricity for amateurs. Amateur constructors' manuals
  
  ## TL - Motor vehicles. Aeronautics. Astronautics
  
      1-484.......................................Motor vehicles. Cycles
      500-777...................................Aeronautics. Aeronautical engineering
      780-785.8................................Rocket propulsion. Rockets
      787-4050.................................Astronautics. Space travel
  
  ## TN - Mining engineering. Metallurgy
  
      263-271...................................Mineral deposits. Metallic ore deposits. Prospecting
      275-325...................................Practical mining operations. Safety measures
      331-347...................................Mine transportation, haulage and hoisting. Mining machinery
      400-580...................................Ore deposits and mining of particular metals
      600-799...................................Metallurgy
      799.5-948................................Nonmetallic minerals
      950-997...................................Building and ornamental stones
  
  ## TP - Chemical technology
  
      155-156...................................Chemical engineering
      200-248...................................Chemicals: Manufacture, use, etc.
      248.13-248.65.........................Biotechnology
      250-261...................................Industrial electrochemistry
      267.5-301................................Explosives and pyrotechnics
      315-360...................................Fuel
      368-456...................................Food processing and manufacture
      480-498...................................Low temperature engineering. Cryogenic engineering. Refrigeration
      500-660...................................Fermentation industries. Beverages. Alcohol
      670-699...................................Oils, fats, and waxes
         690-692.5......................................Petroleum refining. Petroleum products
      700-746...................................Illuminating industries (Nonelectric)
      751-762...................................Gas industry
      785-869...................................Clay industries. Ceramics. Glass
      875-888...................................Cement industries
      890-933...................................Textile bleaching, dyeing, printing, etc.
      934-945...................................Paints, pigments, varnishes, etc.
      1080-1185...............................Polymers and polymer manufacture
  
  ## TR - Photography
  
      250-265...................................Cameras
      287-500...................................Photographic processing. Darkroom technique
      504-508...................................Transparencies. Diapositives
      510-545...................................Color photography
      550-581...................................Studio and laboratory
      590-620...................................Lighting
      624-835...................................Applied photography. Including artistic, commercial, medical photography, photocopying processes
      845-899...................................Cinematography. Motion pictures
      925-1050.................................Photomechanical processes
  
  ## TS - Manufactures
  
      155-194...................................Production management. Operations management
      195-198.8................................Packaging
      200-770...................................Metal manufactures. Metalworking
      780-788...................................Stonework
      800-937...................................Wood technology. Lumber
         840-915.........................................Wood products. Furniture
         920-937.........................................Chemical processing of wood
      940-1047..................................Leather industries. Tanning
      1060-1070................................Furs
      1080-1268................................Paper manufacture and trade
      1300-1865................................Textile industries
      1870-1935................................Rubber industry
      1950-1982................................Animal products
      2120-2159................................Cereals and grain. Milling industry
      2220-2283................................Tobacco industry
      2284-2288................................Animal feeds and feed mills. Pet food industry
  
  ## TT - Handicrafts. Arts and crafts
  
      161-170.7................................Manual training. School shops
      174-176...................................Articles for children
      180-200...................................Woodworking. Furniture making. Upholstering
      201-203...................................Lathework. Turning
      205-267...................................Metalworking
      300-382.8................................Painting. Wood finishing
      387-410...................................Soft home furnishings
      490-695...................................Clothing manufacture. Dressmaking. Tailoring
      697-927...................................Home arts. Homecrafts. Including sewing, embroidery, decorative crafts
      950-979...................................Hairdressing. Beauty culture. Barbers' work
      980-999...................................Laundry work
  
  ## TX - Home economics
  
      301-339...................................The house. Including arrangement, care, servants
      341-641...................................Nutrition. Foods and food supply
      642-840...................................Cooking
      851-885...................................Dining-room service
      901-946.5................................Hospitality industry. Hotels, clubs, restaurants, etc. Food service
      950-953...................................Taverns, barrooms, saloons
      955-985...................................Building operation and housekeeping
      1100-1105...............................Mobile home living
      1110........................................Recreational vehicle living
  