Acetylene for Lighting Country Homes Volume 1, No. 1

Acetylene for Lighting Country Homes Volume 1, No. 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...that would yield definite information about the friction and the working characteristics of lubricants under service conditions. This Bulletin is a preliminary report on the progress of this investigation. PART II CHARACTERISTICS OF FRICTION BETWEEN LUBRICATED SURFACES The general characteristics of friction between-well lubricated surfaces have been pretty well established and only a brief summary will be given here. In the first place it is necessary to point out that it is absolutely essential to have the surfaces thoroughly covered with lubricant. "There are no laws for partially lubricated surfaces." Rubbing surfaces are lubricated in order to reduce wear, lem;'1erature rise and energy losses and the quality of the lubricant should be judged by the extent to which it reduces these effects. As reduction of energy losses usually results also in the reduction of wear and temperature rise the best lubricant would be taken to be the one giving the least energy loss under service conditions provided it did 11ot develop some undesirable characteristic such as acidity or drying out rapidly to a gum, etc., when in use. There are two radically different classes of service to be considered, namely, lubrication of bearings and the lubrication of engine cylinders. The conditions in bearings are simpler and easier to meet. The temperatures are usually moderate and the direction of motion, the speed and the pressure constant. For these reasons a number of machines have been built to measure the friction in bearings. 1 Professor Thurston's apparatus in which a split bearing is clamped on the shaft by spring pressure, thus giving 1 Thurston. Friction and Lost Work. John Wiley 8: Sons. an oil film thickness that depends on the...show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236890094
  • 9781236890092