File:Mineral resources of the United States (1913) (14777728705).jpg

Identifier: mineralresources19132unit (find matches)
Title: Mineral resources of the United States
Year: 1882 (1880s)
Authors: United States. Bureau of Mines Geological Survey (U.S.)
Subjects: Mines and mineral resources Mineral industries
Publisher: Washington : G.P.O.
Contributing Library: Boston Public Library
Digitizing Sponsor: Kahle/Austin Foundation and Omidyar Network

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ed that the temperatureswere such in general as to indicate that all oils of whatever charactermust be heated to a viscosity of 8 Engler in order to burn smokelesslywithout undue excess of air. As a point of interest, any increase ofheating in reducing the viscosity below 8 Engler is not accompaniedby increase in evaporative efficiency. On all the tests the tempera-ture of the oil was dropped for a few minutes at various times belowthat corresponding to 8 Engler, wliile keeping the oil pressure, draft,etc., steady. In every case where the temperature was dropped belowthe critical temperature corresponding to 8 Engler the smoke increasedin density and volume; and as the temperature was again brought upthe smoke disappeared at the same critical temperature. It thusappears that 8 Engler for smokelessness is well established for the pres-ent oil-burning apparatus on board United States naval vessels. (SeePL III and fig. 22.) U. S. GEOLOGICAL SURVEY MINERAL RESOURCES 1913 PART II PLATE III
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■itical viscosity—that is, viscosity dibi . ^ . .smoke/ess nitfioul excess of air. Intersect/on of this line tv/th thecurve gives the temperature to which on oil must be heated to bumthe oU efficiently v/ithoui smoke. •henoil IS being burned viscositiesEngler compared with water at 70 Fahrenheit of this line w/th the/st be heated to bum CURVES SHOWING THE RELATION OF VISCOSITY TO TEMPERATURE FOR VARIOUS FUEL OILS. PETKOLEUM. 959 In connection witli the work of tlie board the Philadelphia Navy-Yard was Instructed to conduct experiments for such oils as mightbe available to determine the permissible content of sulphur and theextent of the corrosion which majr occur with oils containing varioussulphur contents. Various test pieces of steel, both duU and bright,were placed in oils of five different grades as to sulphur content, andthe tanks were heated to 120° F. and maintained at that temperaturefor a month. The second set of tanks was maintained at 100° F.,and the third set was

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