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

Measurement: Sensory (auditory) perception. This device was used to determine the absolute and differential threshold for ...

This electromagnetic tuning fork consists of an electromagnet located between the prongs. This is not the ...

Measurement: Sensory (auditory) perception. This device was used to determine the absolute and differential threshold for ...

This esthesiometer, based on a design by Michotte, consists of a 20 x 1 x 1 ...

The control hammer is necessary to correct the systematic error caused by the unstable current source ...

Measurement: instrument for the graphical representation of time. The kymograph is usually used in long-term measurements ...

This kymograph consists of two drums placed 1 meter apart (one drum is missing here). A ...

This marker pen consists of a marker (top left of the picture) and an electromagnet (the ...

This recording device has an oval opening on top (not visible in the photo) over which ...

Measurement: sensory (visual) perception. Instrument to calculate the absolute and differential threshold for light intensity. Instrument ...

Measurement: sensory (visual) perception. Operation: In the study of contrast effects, small disks are placed on larger ...

The photo does not show the original instrument: it was disassembled. The optical part was retained ...

The device consists of two metal plates connected by a rubber capsule. Attached to the top ...

Glass tube with metal air supply system. Two examples present. Measurement: Sensory (auditory) perception. Operation: The glass can ...