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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

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

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

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

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Double Annealing
Water annealing consists in heating the piece, allowing it to...



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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