A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 18
ne rotation of the drum,can be drawn out into a spiral. Many of the details are differentin other patterns of chronograph, but the object of all kinds isto secure a uniform rotation of the drum. Eecords are made on the moving sheet of paper, by a pen ofspecial construction, or, if the paper be… … Fig. 3. record must therefore be crosswise to the movement of thedrum. If the pen be sharply pulled up or down and let goagain, a notch appears on the curve. This may be accomplishedby a time-marker which consists of a light lever carrying thetracing point, arranged to be pulled down by the…
Physics
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