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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...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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



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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