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Steel Making

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

The material used for all gears on the Liberty engine was sel...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

PHOSPHORUS is an element (symbol P) which enters the metal fr...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Tungsten, as an alloy in steel, has been known and used for a...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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.

Next: An Automatic Temperature Control Pyrometer

Previous: Compensating Leads

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