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Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

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

Quenching
It is considered good practice to quench alloy steels from th...



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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