Heavy Metal Music.ca - find lists of heavy metal bands that you can search by type of metal. Visit Heavy Metal Music.caInformational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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



Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer






Category: PYROMETRY AND PYROMETERS

For extremely high temperature, the optical pyrometer is
largely used. This is a comparative method. By means of the rheostat
the current through the lamp is adjusted until the brightness of
the filament is just equal to the brightness of the image produced
by the lens L, Fig. 123, whereupon the filament blends with or
becomes indistinguishable in the background formed by the image
of the hot object. This adjustment can be made with great accuracy
and certainty, as the effect of radiation upon the eye varies some
twenty times faster than does the temperature at 1,600 deg.F., and some
fourteen times faster at 3,400 deg.F. When a balance has been obtained,
the observer notes the reading of the milliammeter. The temperature
corresponding to the current is then read from a calibration curve
supplied with the instrument.



As the intensity of the light emitted at the higher temperatures
becomes dazzling, it is found desirable to introduce a piece of red
glass in the eye piece at R. This also eliminates any question
of matching colors, or of the observer's ability to distinguish
colors. It is further of value in dealing with bodies which do
not radiate light of the same composition as that emitted by a
black body, since nevertheless the intensity of radiation of any
one color from such bodies increases progressively in a definite
manner as the temperature rises. The intensity of this one color
can therefore be used as a measure of temperature for the body
in question. Figures 124 to 126 show the way it is read.





Next: Correction For Cold-junction Errors

Previous: Leeds And Northrup Optical Pyrometer



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 3987