DRAFT OF A CLASSIFICATION FOE, THK WORLd's FAIR. 715 



822. Hyi>i{ai'i.ic ani> Mauink E.vitIneeking — (.'outiuued. 



Ob.stiiictions in rivers ami harbors. 



River, harl)oi- and coast surveys. (Seajjorts and liarl)ors, see 81.) 

 Plans of submarine structures — fouudatious for piers, light-houses, docks 

 and breakwaters. (Light-houses, see also 306; harbor protection, etc., 

 317, 318; for tools and machinery for hydraulic work, sec 402.) 



823. Bridge Exgineehing. (Illustrated by drawings and models.) 



Bridge designing. Drawings and charts showing methods of calculating 



stresses. 

 Fouudatious, piers, abutments, and approaches of stone, wood, etc. 

 Arch bridges of stone, wood or iron. 

 Suspension l)ridges of fiber, irou, chain and cable. 

 Truss bridges of wood, iron and steel — ])ony, bowstring, and plate girders, 



lattice girders. Fink, BoUman, Howe, Pratt, Warren, Post, Long, Whipple, 



and other trusses of special design. 

 Cantilever bridges. Draw-bridges. Rolling and swinging machinery. 

 Tubular bridges. 



Railway, aqueduct, and other bridges of special design, not elsewhere classed. 

 (A chart showing date of completion, span, rise, weight and cost of the 



great bridges of the world would be of interest.) 



824. TUNXELS. (For mine engineering, see 210-219. ) 



Profile and sectional jilans of tunnels, shafts and approaches. 



Air shafts and special devices for lighting and ventilation. 



Shields, cases and protection of tunnel walls against watei' an<l landslides. 



(For building stones, see 242-246). 



(For tools and machinery for blasting and drilling, see 222; blasting and 



explosives, see 226.) 

 Charts of the St. Gothard Railway and other great tunnels miglit be shown. 



825. Mechaxical Engineering. 



The designing of locomotives, engines, and machines. 



Plans of machine shops, and systems of machinery for manufactories and 



metallurgical establish men ts. 

 Machine i for moving and handling heasy weights — cranes, etc. 

 (See also Classes 401-419). 



826. Railroad Engineering. 



Location of railways — topographical maps showing preliminary surveys, 

 profiles of cuts and fills, estimates of excavation and embankment, methods 

 of determining curves and grades, locations of bridges and tunnels. 



Plans of terminals with reference to water courses or other railways. 



(For Permanent Way, Stations and Rolling Stock, see 41.) 



827. Military Engineering. 



I'lans of fortifications and other military works. 



Methods for the rapid construction of roads, railway bridges, telegraph lines, 



etc., in time of war. 

 Pontoons and other temporary bridges ami structures of timber, etc. 

 Plans of portable hospitals and other buildings. 

 Field telegraphs, methods of trans])orting and erecting telegraph lines, 



captive balloon telegraph. 

 Field signal train. 

 (For War, see 886, A). 



828. The Designing of Buildings and Materials of Construction. 



Plans of pulilic buildings for special jiurposes. Large and small dwelling- 

 houses. 



Drawings and s])ecifications for foundations, walls, partitions, floors, roofs 

 and stairwavs. 



