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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

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

Silicon prevents, to a large extent, defects such as gas bubb...

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...

PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

Furnace Data
In order to give definite information concerning furnaces, fu...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

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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