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A New Determination of the Electromotive Force of Weston and Clark Standard Cells by an Absolute Electrodynamometer (Classic Reprint)



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A New Determination of the Electromotive Force of Weston and Clark Standard Cells by an Absolute Electrodynamometer (Classic Reprint) by Karle E Guthe
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Excerpt from A New Determination of the Electromotive Force of Weston and Clark Standard Cells by an Absolute Electrodynamometer In the construction of the electrodynamometer as a whole (see Fig. 2) care was taken to avoid any additional field which might produce a torsional moment upon the movable coil. The terminal binding posts of the two wires on either end of the stationary coil were placed in the same straight line parallel to the axis. They were fastened to a hard rubber block screwed into the plaster of Paris by means of brass screws. The wires were continued to the straight line and then bent at right angles, thus leading to the bind ing posts. They were held permanently in this position by the hard rubber blocks. Since in all experiments the current was sent through the two stationary wires in series, the two inner binding posts were connected by a straight wire. The current on leaving the second stationary coil was carried along another straight wire parallel to the axis back to the leading-in wire, where the two were twisted together until they reached at a distance of about 60 centi meters a small commutator. One of the leads was connected to one of the mercury cups of the commutator, while the other continued to the battery. The two wires leading to the movable coil started from two of the mercury cups and were twisted until they reached the mercury cups of the movable coil to be described presently. The fourth mercury cup connected with the battery circuit. By means of this commutator the current in the movable coil could be reversed while the direction in the stationary coil remained the same. By means of another commutator, several meters distant, the current through the whole instrument. Could be reversed. This gives four possible combinations for the direction of the current in the instrument. In the battery circuit was inserted the standard resistance from the terminals of which two potential wires led to the potentiometer. The latter apparatus could be connected either to the resistance or to the standard cells whose emf. Was to be measured. In order to be able to bring the movable coil to rest rapidly the instrument was shunted by a circuit containing a dry cell and a high resistance. By judicious working of the key in this circuit the amplitude of the Vibration could in a very short time be reduced to a couple of millimeters on the scale. The connection with the movable coil was made by means of two mercury cups arranged one below the other. The current was carried to the upper. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Release date Australia
October 13th, 2016
Country of Publication
United States
, black & white illustrations
Forgotten Books
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