 |
This multicellular voltmeter design had its beginnings in the Thomson Quadrant Electrometer (1). This instrument consists of a number of quadrants hooked to the needle indicator that are electrostatically attracted to an opposite, which are connected to the case. |
 |
The dial face is about 8" across. The paper scale (white strip in the picture) is non-linear and numbered 0-150 |
 |
"Lord Kelvin's Patents Multicellular Voltmeter No. 748 James White Glasgow" |