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Steel Making

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

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

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

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

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

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

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



Brown Automatic Signaling Pyrometer






Category: PYROMETRY AND PYROMETERS

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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