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Steel Making

Chromium when alloyed with steel, has the characteristic func...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Critical Points
One of the most important means of investigating the properti...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

There is no mystery or secret about the proper annealing of d...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

MANGANESE is a metal much like iron. Its chemical symbol is M...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

The forgings can be hardened by cooling in still air or quen...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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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