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

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

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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...



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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