"Oh Father," said a little Frog to the big one sitting by the side of a pool, "I have seen such a terrible monster! It was as big as a mountain, with horns on its head, and a long tail, and it had hoofs divided in two." "Tush, child, tush... Read more of The Frog and the Ox at Children Stories.caInformational Site Network Informational
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Steel Making

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

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

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

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

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

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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



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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