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Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Heating
Although it is possible to work steels cold, to an extent de...

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

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

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



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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