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An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Silicon prevents, to a large extent, defects such as gas bubb...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

ANNEALING can be done by heating to temperatures ranging from...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Manganese adds considerably to the tensile strength of steel,...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Reheating for machine ability was done at 100 deg. less than ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Brown Automatic Signaling Pyrometer


In large heat-treating plants it has been customary to maintain
an operator at a central pyrometer, and by colored electric lights
at the furnaces, signal whether the temperatures are correct or
not. It is common practice to locate three lights above each
furnace-red, white and green. The red light burns when the temperature
is too low, the white light when the temperature is within certain
limits--for example, 20 deg.F. of the correct temperature--and the
green light when the temperature is too high.

Instruments to operate the lights automatically have been devised and
one made by Brown is shown in Fig. 130. The same form of instrument is
used for this purpose to automatically control furnace temperatures,
and the pointer is depressed at intervals of every 10 sec. on contacts
corresponding to the red, white and green lights.

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