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Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

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

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

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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



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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