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The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...



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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