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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Quenching
It is considered good practice to quench alloy steels from th...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...



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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