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Figures (5)

Fig. 1
Fig. 1

“Ultramicrometer circuit” first used by the author. The grid battery increases the sensitivity.

Fig. 2
Fig. 2

A circuit with grid leak and grid condenser, giving a sensitivity of 4 mA per μμF capacity variation.

Fig. 3
Fig. 3

Racks upon which vibration tests were made.

Fig. 4
Fig. 4

Condenser, used for measuring the vibrations of the racks, Fig. 3.

Fig. 5
Fig. 5

Records of the vibrations of a rack Fig. 3, obtained with a Siemens oscillograph. The measurements are made at a depth of 6 m below the surface of water.