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Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Critical Points
One of the most important means of investigating the properti...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Conclusions
Martien was probably never a serious contender for the honor ...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

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

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



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






Category: PYROMETRY AND PYROMETERS

For extremely high temperature, the optical pyrometer is
largely used. This is a comparative method. By means of the rheostat
the current through the lamp is adjusted until the brightness of
the filament is just equal to the brightness of the image produced
by the lens L, Fig. 123, whereupon the filament blends with or
becomes indistinguishable in the background formed by the image
of the hot object. This adjustment can be made with great accuracy
and certainty, as the effect of radiation upon the eye varies some
twenty times faster than does the temperature at 1,600 deg.F., and some
fourteen times faster at 3,400 deg.F. When a balance has been obtained,
the observer notes the reading of the milliammeter. The temperature
corresponding to the current is then read from a calibration curve
supplied with the instrument.



As the intensity of the light emitted at the higher temperatures
becomes dazzling, it is found desirable to introduce a piece of red
glass in the eye piece at R. This also eliminates any question
of matching colors, or of the observer's ability to distinguish
colors. It is further of value in dealing with bodies which do
not radiate light of the same composition as that emitted by a
black body, since nevertheless the intensity of radiation of any
one color from such bodies increases progressively in a definite
manner as the temperature rises. The intensity of this one color
can therefore be used as a measure of temperature for the body
in question. Figures 124 to 126 show the way it is read.





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Previous: Leeds And Northrup Optical Pyrometer



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