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This attachment can be fastened to the base of a Harvard Apparatus Company's kymographion by means of a single thumb screw, as shown at A in the illustration. The device is "set" by pulling out the plunger by means of the ring B. When the knob C is pulled the drum will be spun around rapidly for one revolution and then stopped in exactly the same position as that from which it started. The writing-points of all muscle levers, tuning-fork. etc., remain constantly on the even surface of the drum paper. The plunger can be at once "set" and the drum spun again as many times as desired, thus allowing superimposed curves to be taken on the same base line. A set-screw D can be adjusted to regulate the speed at which the drum spins. A special clamp E fastened to the lower part of the drum permits it to be
JACKSON DE. A DRUM-SPINNING ATTACHMENT FOR AN ORDINARY KYMOGRAPHION. JAMA. 1911;LVI(23):1705. doi:10.1001/jama.1911.02560230007004