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Steel Making

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Annealing
There is no mystery or secret about the proper annealing of d...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Hardening
Steel is hardened by quenching from above the upper critical....

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

The Electric Process
The fourth method of manufacturing steel is by the electric f...



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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