of theCoraptoir ed, maps to a scale of 1-10,000 General Photographique, con- and 1-14,000 were used. sists of a wooden box (Fig. 3) Fig. 4 gives a reproduction, suspended beneath the bal- on a reduced scale, of the loon. The ropes that sup- sixth negative taken after the X'^.J^^J port it unite at a… … constructed an aneroid baro- Fig. 4.-BEDUCTI0N OF NEGATIVES OBTAINED WITH THE AFPABATUS. rays to pass for a period not meter which I have so ar- CAILLETET'S AUTOMATIC PHOTOGRAPHIC APPAEATUS. exceeding ^^ of a second. ranged that the needle may The two luminous rays make two entire revolutions…
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