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Steel Making

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...



Placing Of Pyrometers






Category: PYROMETRY AND PYROMETERS

When installing a pyrometer, care should be
taken that it reaches directly to the point desired to be measured,
that the cold junction is kept cold, and that the wires leading to
the recording instrument are kept in good shape. The length of
these lead wires have an effect; the longer they are, the lower
the apparent temperature.

When pyrometers placed in a number of furnaces are connected up
in series, and a multiple switch is used for control, it becomes
apparent that pyrometers could not be interchanged between furnaces
near and far from the instrument without affecting the uniformity
of product from each furnace.

Calibration can best be done without disturbing the working pyrometer,
by inserting the master instrument into each furnace separately, place
it alongside the hot junction of the working pyrometer, and compare
the reading given on the indicator connected with the multiple
switch.

Protection tubes should be replaced when cracked, as it is important
that no foreign substance is allowed to freeze in the tube, so
that the enclosed junction becomes a part of a solid mass joined
in electrical contact with the outside protecting tube. Wires over
the furnaces must be carefully inspected from time to time, as no
true reading can be had on an instrument, if insulation is burned
off and short circuits result.

If the standard calibrating instrument used contains a dry battery,
it should be examined from time to time to be sure it is in good
condition.





Next: The Leeds And Northrup Potentiometer System

Previous: Complete Calibration Of Pyrometers



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