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

Steel Making

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

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...



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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