It consists essentially of a fine platinum wire supported by a tilting device in connection with the two poles of a pile composed of three Leclanche elements.

The instruments used were a telephone in one circuit, and in the other about twenty-five Leclanche cells and an interrupter.

The Leclanche battery is exclusively used in measurements for comparison.

The same cells again become extremely sensitive with the Leclanche battery.

Although the Leclanche has operated well, some other may operate still better, and by its special fitness for use on selenium cells may intensify their actions, and so bring to light other properties yet unthought of.

One cell whose highest ratio in light was about 83 to 1, with the Leclanche battery, when measured with my battery gave a ratio of 120 to 1.

It seems to make the resistance of the cell both higher in dark and lower in sunlight than with the Leclanche battery.

This cell measured, with 25 elements of Leclanche, 40,000 ohms.

Table C gives some recent results obtained with L B cells, including one whose resistance, with 25 elements Leclanche, was 11,381 times as high as with 8 elements, and which, after standing steadily at 123 ohms (and then at 325 ohms with 1 element), on receiving the current from 25 elements again returned to its previous figure of 1,400,000 ohms.