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Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

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

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

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

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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



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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