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 story1746-196315601746-290143071525-280684801746-299729961746-299559681746-196324666145-292686941848-507682731746-196330981746-299666801525-279401121746-289923286145-292675086176-659901734220-204279976188-681002671746-290117391746-1113577411746-289992904443-732103584220-204041174430-127936188-555546001746-299704721525-279156021746-289975041746-299667791746-289976221746-300023831746-300004741746-289997291746-289994651746-289994571746-290156881525-279086801746-196307054430-86431746-196790994443-93661746-299558124220-218891171746-289993181746-1119296786176-660840474220-218760241525-280912686176-660811621746-299610444220-219324574220-219338541746-299560451746-299995931746-299991184430-78961746-289993441746-289999366176-660779596176-670423831525-281149161746-289999886188-555549484409-1537196176-660819901848-501653176176-660840321899-504388591746-289994211746-300015461746-299584936188-539077436145-292899571848-549332846188-555531296188-645840441848-502123761746-300015296145-589208081746-299995261746-290146534409-630105021746-299712841746-290147581746-299610381746-299712654435-35191746-299562204409-962086176-660860156176-660779556188-555538791788-220723711848-501674236145-292626951746-196677771525-230328981848-507844474220-204002694409-627297541746-289826626145-29280134 PREVIOUS of 3 NEXT