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Hardness Testing
The word hardness is used to express various properties of me...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...



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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