Informational Site NetworkInformational Site Network
Privacy
 
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Critical Points
One of the most important means of investigating the properti...

Impact Tests
Impact tests are of considerable importance as an indication ...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Hardening
The forgings can be hardened by cooling in still air or quen...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

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

Hardness Testing
The word hardness is used to express various properties of me...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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



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 2916