galvanometer for pyrometer
Date: 1910-1920
Inventory Number: 0253
Classification: Galvanometer
Subject:
Maker: Hartmann & Braun AG (1879 - 1999)
Supplier: Charles W. Engelhard Sr. (1902-present)
Cultural Region:
Dimensions:
15.6 × 19 × 18.8 cm (6 1/8 × 7 1/2 × 7 3/8 in.)
Description:
This is a sensitive meter with a moving coil and short suspension. There are two scales on the dial: 0-17 mV (electric current) and 0-3000°F (temperature). The internal resistance is 1049 ohms. The casing consists of a circular brass case on wooden base with leveling screws and binding posts. There is a short brass suspension tube and a C-shaped magnet.
The base has been numbered "894". There is also an old Harvard inventory number: "5088".
The base has been numbered "894". There is also an old Harvard inventory number: "5088".
Signedon dial: HB
on dial: Charles Engelhard / Hudson Terminal Buildings / 30 Church Street / New York
on dial: Charles Engelhard / Hudson Terminal Buildings / 30 Church Street / New York
Inscribedon dial: D.R.P. [and] MADE IN GERMANY
base numbered: 894
base numbered: 894
FunctionA galvanometer is an instrument designed to measure the amount of electric current. This one was used with a pyrometer, such as 1998-1-0448.
A pyrometer is an instrument used for measuring the temperature of heat radiating substance. This measurement is based on the Stefan-Boltzmann law. Radiation heat would be focused on thermocouples found inside the pyrometer. These would produce a small electrical current picked up by the binding posts. That current would then be transmitted to a galvanometer such as this one. A reading of the electric current on the dial would directly give, from the second scale on this galvanometer, the temperature of the substance under study.
For a general discussion, go to the following website.
A pyrometer is an instrument used for measuring the temperature of heat radiating substance. This measurement is based on the Stefan-Boltzmann law. Radiation heat would be focused on thermocouples found inside the pyrometer. These would produce a small electrical current picked up by the binding posts. That current would then be transmitted to a galvanometer such as this one. A reading of the electric current on the dial would directly give, from the second scale on this galvanometer, the temperature of the substance under study.
For a general discussion, go to the following website.
ProvenanceFrom the Engineering School, Harvard University.