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Steel Making

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Gears
The material used for all gears on the Liberty engine was sel...

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



Leeds And Northrup Optical Pyrometer






Category: PYROMETRY AND PYROMETERS

The principles of this very popular method of measuring temperature
are sketched in Fig. 123.




The instrument is light and portable, and can be sighted as easily
as an opera glass. The telescope, which is held in the hand, weighs
only 25 oz.; and the case containing the battery, rheostat and
milliammeter, which is slung from the shoulder, only 10 lb.




A large surface to sight at is not required. So long as the image
formed by the objective is broader than the lamp filament, the
temperature can be measured accurately.


recorder.]



Distance does not matter, as the brightness of the image formed
by the lens is practically constant, regardless of the distance
of the instrument from the hot object.



The manipulation is simple and rapid, consisting merely in the turning
of a knurled knob. The setting is made with great precision, due to
the rapid change in light intensity with change in temperature and
to the sensitiveness of the eye to differences of light intensity.
In the region of temperatures used for hardening steel, for example,
different observers using the instrument will agree within 3 deg.C.


Only brightness, not color, of light is matched, as light of only
one color reaches the eye. Color blindness, therefore, is no hindrance
to the use of this method. The use of the instrument is shown in
Fig. 127.





Next: Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer

Previous: Placing The Thermo-couples



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