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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Hardness Testing
The word hardness is used to express various properties of me...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...



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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