Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1987-03-13
1988-05-17
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
116217, 374210, G01K 1106
Patent
active
047446714
ABSTRACT:
A simple and inexpensive instrument for measuring electric current that may be mounted on existing current-carrying conductors to provide a ready visible indication of the current flowing through the conductor. The instrument comprises an outer transparent tube mounted coaxially with the current-carrying conductor, a number of O-rings mounted within the tube and spaced along the length of the tube to form different compartments along the instrument, and a number of differently colored tubular indicators respectively forming the inner walls for the compartments, with each compartment being filled with a material, such as paraffin wax, which melts at a different temperature from the material in the other compartments, to become transparent and reveal the corresponding colored inner indicator, when the current in the conductor heats the conductor to a particular temperature.
REFERENCES:
patent: 1623666 (1927-04-01), Ferkel
patent: 3067312 (1962-12-01), McFarlane
patent: 3125984 (1964-03-01), Okuyama
patent: 3576129 (1971-04-01), Crites
patent: 4092625 (1978-05-01), Newson
patent: 4118667 (1978-10-01), Milligan
patent: 4298794 (1981-11-01), Snitzer et al.
Beecher Keith D.
Yasich Daniel M.
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