Photographing A Heart Beat
Oue of the most remarknblo applications et photography is tlmt hy which it 8 ïiov made to register, ;md in the most accurate manncr, tho mechanica] motion of Üio heart. The. devioe by which tliis ; resnlt is attained is, indeed, a triumph of inventive skill. ít consiste of a thin india-rnbber bag, to wlvich i short glnss ia attiicliedj atifiioient merenry is ])onved iiitu th,o apparatus to lili tho bug and i portion of the tube, mid tho iugtEUiueut is (hen placed over the heart of th(! pereoQ to bfi exuminod. Arraugediu this maiui', r, t 'very pulsation of the hcart is indieated by a correspondiiig movement of the mercury in the tube, and, by snitablc photographic appamtus, provided with a nioving sensitive slip of paper, a perfect registration of the esteut and rate of the pulsation is obtained. The interesting fact is made known by this process that the fall of the pulse sometimes takes place in successive horizontal Unes, the column reascending two or three times before fallDg altogether.
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Old News
Michigan Argus