The operational principles of the ratio pyrometers were developed in the 1920s and 1930s, and they were commercially available in 1939.
32.
Temperature measurement was initially done by Basset using an optical pyrometer to measure the intensity of the incandescent light from the sample.
33.
This created another new industry and led to the formation of the William H . Bristol Pyrometer Company in New York City.
34.
In 1963 Land Pyrometers sold their Queens Road factory in Sheffield and moved to a new purpose-built factory in Dronfield.
35.
The temperature of the black-body is then adjusted until a match exists between its intensity and that of the pyrometer filament.
36.
In the early days of measurement of high temperatures, another factor was important, and used by Josiah Wedgwood in his pyrometer.
37.
A "'pyrometer "'is a type of remote-sensing thermometer used to measure the temperature of a surface.
38.
Modern pyrometers or infrared thermometers also measure the temperature of cooler objects, down to room temperature, by detecting their infrared radiation flux.
39.
He developed procedures for the analysis of alloy constituents and an automatic recording pyrometer used to record temperature changes in furnaces and molten materials.
40.
An example is the measurement of temperature inside aircraft jet engines by using a fiber to transmit radiation into a radiation pyrometer outside the engine.
