Tonometer
Tonometers are secondary frequency standards, and often consist
of a series of cicular cylinders suspended by light cords from their two nodal
points. The frequency is inversely proportional to the square root of the
length, which enables the higher frequency rods to be machined to the right
lengths. This set of tonometer bars was made by the Standard Scientific Company
of New York and is in the collection of the Physics Department at the University
of Texas. It probably dates from the first quarter of the twentith
century. Other tonometers can be found with the Rudolf Koenig
aparatus.
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