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Steel MakingHardening High-speed SteelIn forging use coke for fuel in the forge. Heat steel slowly ... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Plant For Forging Rifle Barrels The forging of rifle barrels in large quantities and heat-tre... The Theory Of Tempering Steel that has been hardened is generally harder and more br... Using Illuminating Gas The choice of a carburizing furnace depends greatly on the fa... Critical Points One of the most important means of investigating the properti... Phosphorus PHOSPHORUS is an element (symbol P) which enters the metal fr... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Pyrometers Armor plate makers sometimes use the copper ball or Siemens' ... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... William Kelly's Air-boiling Process An account of Bessemer's address to the British Association w... Conclusions Martien was probably never a serious contender for the honor ... Carburizing Low-carbon Sleeves Low-carbon sleeves are carburized and pushed on malleable-ir... Chrome-nickel Steel Forging heat of chrome-nickel steel depends very largely on ... Brown Automatic Signaling Pyrometer In large heat-treating plants it has been customary to mainta... Tensile Properties Strength of a metal is usually expressed in the number of pou... Annealing Work With the exception of several of the higher types of alloy s... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Quenching Tool Steel To secure proper hardness, the cooling of quenching of steel ... |
Brown Automatic Signaling PyrometerCategory: PYROMETRY AND PYROMETERS In large heat-treating plants it has been customary to maintain an operator at a central pyrometer, and by colored electric lights at the furnaces, signal whether the temperatures are correct or not. It is common practice to locate three lights above each furnace-red, white and green. The red light burns when the temperature is too low, the white light when the temperature is within certain limits--for example, 20 deg.F. of the correct temperature--and the green light when the temperature is too high. Instruments to operate the lights automatically have been devised and one made by Brown is shown in Fig. 130. The same form of instrument is used for this purpose to automatically control furnace temperatures, and the pointer is depressed at intervals of every 10 sec. on contacts corresponding to the red, white and green lights. Next: An Automatic Temperature Control Pyrometer Previous: Compensating Leads
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