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Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Conclusions
Martien was probably never a serious contender for the honor ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Annealing Work
With the exception of several of the higher types of alloy s...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...



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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