| What is called the Line of Marriage is that mark or marks, as the case may be, found on the side of the Mount under the fourth finger. I will first proceed to give all the details possible about these lines, and then call my reader's atten... Read more of Signs Relating To Marriage at Palm Readings.org |  InformationalPrivacy |
Steel MakingRate Of CoolingAt the option of the manufacturer, the above treatment of gea... Heat Treatment Of Punches And Dies Shears Taps Etc HEATING.--The degree to which tools of the above classes shou... Pickling The Forgings The forgings were then pickled in a hot solution of either ni... Quenching The Work In some operations case-hardened work is quenched from the bo... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Connecting Rods The material used for all connecting rods on the Liberty engi... Phosphorus Phosphorus is one of the impurities in steel, and it has been... Tensile Properties Strength of a metal is usually expressed in the number of pou... Preventing Decarbonization Of Tool Steel It is especially important to prevent decarbonization in such... Standard Analysis The selection of a standard analysis by the manufacturer is t... Typical Oil-fired Furnaces Several types of standard oil-fired furnaces are shown herew... Double Annealing Water annealing consists in heating the piece, allowing it to... Hardening Steel is hardened by quenching from above the upper critical.... Sulphur Sulphur is another impurity and high sulphur is even a greate... Mushet And Bessemer That Mushet was "used" by Ebbw Vale against Bessemer is, perh... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Properties Of Steel Steels are known by certain tests. Early tests were more or l... |
Optical System And Electrical Circuit Of The Leeds & Northrup Optical PyrometerCategory: 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
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