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

Steel Making

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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



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 4144