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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 pointsdoi:10.1038/scientificamerican08151885-8014supp fatcat:wjmhs2a4lzegjos64ymlhhef5a