Mechanical Devices and EngineeringArtifacts illustrating early mechanical devices like a perpetual motion fountain, an onager, and various engineering tools from the 18th and 19th centuries. Alexander Graham Bell's photophone, which uses light to transmit sound. Date: 1880 210 assets in this story1746-19556188-609869061746-299724281525-279353811746-299724211889-604194824220-218367071746-289932374409-172675771746-196687651746-289995271746-299560981746-196684961525-280685251746-299581521746-299612241746-196318486176-670468691746-289978301746-196250841746-299580944430-121601746-299610226145-292512401746-299579951746-299610501899-199218621746-299579111746-300021311746-289992621746-289932641525-279393361746-300015561746-300016201746-196311351746-300024671746-300014741746-289994221746-299712451746-289991091746-300009766188-681232931746-300022081746-289994161746-299710961746-289958621525-279215431746-196322911746-196313001746-299583721746-196313101746-299565081746-299993251746-289827871746-299996711746-1113449471746-195817801746-290145101899-199220121746-289829461746-196318431746-300023556188-555546261746-300003341746-289994411746-300020421525-279353886176-660808151746-196787601746-299987941899-535153571746-289995161899-199231071746-300025911746-299725851525-280469341746-289790151746-1119452401746-289991721746-300016086188-555539471746-299989381746-289992971746-299583801746-196250681746-299725831899-614550091746-289996601746-299672611848-539235421746-290152151746-50046176-659901201746-299614426176-660852186176-659883396176-660800831848-610515191525-278685101746-30000275 PREVIOUS of 3 NEXT