On the Conversion of Heat into useful Work

William Anderson
1885 Scientific American  
SCIENTIFIC AMERICAN SUPPLEMENT, No. 502. AUGUST 15, 1885. ratus and the bobbin of wire to be unwound. He will be freed from the weight of a pile. 'At rest, the a P l'a ratus suspended by its ring stretches a spring which carries this ring, and which performs the role of the hook of the ordinary apparatus. Figs. 43 and 44 show the applications of, this appa ratus. The first shows us an artillery officer in obser vation nnder a shelter during practice in firing. He gets the exact falling points
more » ... ct falling points of the projectiles shot at a mock battery'that may blOl seen, and, by means of the telephone transmits them to the officer who is in com mand of t�e school of practice-telling him how far the shots have fallen short of or gone beyond the mark, and how far' to the right or left. In the second engraving we perceive a staff officer reconnoitering. He has adyanced to the . edge of �he woods that 8hields the troops, while a soldier followmg in his footsteps unwinds and lays a telephone Hne that keeps the observer inconstant commumcation with his chief, --'La LumieTe Eleot1'ique.
doi:10.1038/scientificamerican08151885-8014supp fatcat:wjmhs2a4lzegjos64ymlhhef5a