VIEW THE MOBILE VERSION of www.steelmaking.ca Informational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

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

Hardening
Steel is hardened by quenching from above the upper critical....

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...



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



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 3457