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Steel Making

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

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

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

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Annealing Work
With the exception of several of the higher types of alloy s...

Corrosion
This steel like any other steel when distorted by cold worki...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Heating
Although it is possible to work steels cold, to an extent de...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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



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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