This device consists of a brass cylinder with capsule. Above the opening in this capsule is ...

Measurement: Sensory (auditory) perception. Instrument for determining the discrimination threshold of the pitch. Physical description: This device ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

A wattmeter is an analogue electrical measuring instrument used to calculate electrical power. This wattmeter was ...

A wattmeter is an analogue electrical measuring instrument used to calculate electrical power. This wattmeter was ...

A wattmeter is an analogue electrical measuring instrument used to calculate electrical power. This wattmeter was ...

An oscilloscope is an electronic measuring instrument that can effectively visualise cyclic variations in an electrical ...

This analogue moving coil device was used in an electronic clock. The time corresponded to an ...

Measurement: Instrument for investigating motor fatigue. This is part of the 'Mosso Ergograph' (the 'appareil d'immobilisation') ...

This instrument consists of two red wooden columns with a metal lamella. Mirrors are attached to ...

A 1000-watt lamp can be adjusted in height and width by rotary knobs at the back ...

A wooden viewing box has an opening at the front and top. Inside is an oblique ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

An ammeter or current meter is a measuring instrument that measures the magnitude of electric current. ...

A voltmeter is a device used to measure electrical voltage. The value is indicated in volts. ...

This vacuum meter was used for measuring pressure below atmospheric pressure.