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Model of a telephone

Voltmeter

Glass sphere with liquid for centrifugal machine

Apparatus to determine the proportion of heat energy to the total energy of an incandescent lamp

Air pump plate with manometer and receiver

Reflection apparatus, fall machine

Small induction coil, 3 cm spark

Leyden jar with movable coatings, conical

Spectro-photometer according to Koenig-Martens

Psychrometer