. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 160 THE SIGNS OF LIFE at regular intervals. In this class of observations, a speed of 2^ to 5 mm. per minute is usually sufficient. The " lost time " of nerve- skin reaction is a good instance of a phenomenon fitted for the galvanometric record, ^ Figs. 28 and 43. It is convenient to adopt a standard size of recording plate ; the "quarter plate" in England, and the 9 by 12 on the Continent, answer all ordinary purposes. These dimensions enable us to record a series of deflections with
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 160 THE SIGNS OF LIFE at regular intervals. In this class of observations, a speed of 2^ to 5 mm. per minute is usually sufficient. The " lost time " of nerve- skin reaction is a good instance of a phenomenon fitted for the galvanometric record, ^ Figs. 28 and 43. It is convenient to adopt a standard size of recording plate ; the "quarter plate" in England, and the 9 by 12 on the Continent, answer all ordinary purposes. These dimensions enable us to record a series of deflections with an amplitude varying from I to 5 cm., and a length of at least 10 cm. The speeds named. Fig. 63.—Galvanograph and Railway Myograph. give records lasting 40 and 20 minutes ; 5 mm. per second gives a 20 seconds record. For speeds above 5 mm. per second a record- ing electrometer should be used. Simultaneous records.—In certain cases it is desirable to obtain the simultaneous record of a series of electrical reactions and of the corresponding series of muscular contractions. For this purpose, a truck carrying a smoked plate, and con- nected with the suspended carrier that holds the photographic plate, is added to the apparatus. The thread by which the carrier is suspended passes round the axis of the motor and over two small pulleys, and is fastened to the carrier of the smoked plate,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Waller, Augustus Désiré, 1856-1922. New York : E. P. Dutton
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