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Ammeter

Siren disk with 5 rows of holes and 5 air-jets, belt-pulley

Bichromate pile, bottle form, according to Grenet

Galton's whistle

Planimeter according to Amsler

Hypsometer

Set of 9 conical open resonators

Tovameter

Electrostatic multi-cellular voltmeter

Selenium cell, photoelectric cell