Object, Instrument, Technology

See also Tuning fork

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

The vibration microscope is an electromagnetically-driven adaptation by Hermann von Helmholtz (1821-1894) of the earlier optical comparator by Jules Antoine Lissajous (1822-1880). The device allows one to determine the frequency of a tuning fork or other vibrating object with respect to a fork of known frequency, by way of Lissajous figure analysis.

Object, Instrument, Technology

Wooden sticks, when dropped on the floor, sound a variety of tones. While the bars of a xylophone are varied in tone by changing their length, these “tone bars” are all of the same length and width, but have different thicknesses and different densities and elastic properties.

Object, Instrument, Technology

The Case Collection of Physics Instruments (CCPI) has several dozen forks mounted on resonance boxes (see Fig. 1).

Object, Instrument, Technology

A tonometer consists of a series of steel cylinders that resonate at specific frequencies upon being struck with a metal hammer. They are used as standards for high frequencies, in the same manner as tuning forks. The transverse vibrational frequencies (i.e. fundamental and harmonics) of a given cylinder depend on the length, elastic modulus, and linear density of the metal.

Object, Instrument, Technology

See also Tuning fork

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

Date of production: 1950s

Object, Instrument, Technology

Organ pipes came in a variety of forms, each producing desired overtones.

Object, Instrument, Technology

Invented by John Shore in 1711, the tuning fork was initially used by musicians. After Chladni’s studies of its vibrations, however, it was also extensively employed by acousticians, who praised the purity of its sound. Hermann von Helmholtz, especially, based his experiments with beats, combination tones, and simple tones on tuning forks attached to resonators that enhanced their suitability for experimentation.

Object, Instrument, Technology

Source: Deutsches Museum, Munich (https://digital.deutsches-museum.de/item/4423/)