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Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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



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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