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Steel Making

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



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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