Scientific American Supplement, No. 421, January 26, 1884 eBook

This eBook from the Gutenberg Project consists of approximately 108 pages of information about Scientific American Supplement, No. 421, January 26, 1884.

[Illustration:  FARCOT’S six H.P.  Steam engine
  Fig. 1.—­Longitudinal Section (Scale 0.10 to 1). 
  Fig. 2.—­Horizontal Section (Scale 0.10 to 1). 
  Fig. 3.—­Section across the Small Cylinder (Scale 0.10 to 1). 
  Fig. 4.—­Section through the Cross Head (Scale 0.10 to 1). 
  Fig. 5.—­Application for a Variable Expanion (Scale 0.10 to 1).]

As shown in Fig. 5, there may be applied to this engine a variable expansion of the Farcot type.  The motor being a single acting one, a single valve-plate suffices.  This latter is, during its travel, arrested at one end by a stop and at the other by a cam actuated by the governor.  Upon the axis of this cam there is keyed a gear wheel, with an endless screw, which permits of regulating it by hand.

This engine, which runs at a pressure of from 5 to 6 kilogrammes, makes 150 revolutions per minute and weighs 2,000 kilogrammes. —­Annales Industrielles.

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We illustrate a foot lathe constructed by the Britannia Manufacturing Company, of Colchester, and specially designed for use on board ships.  These lathes, says Engineering, are treble geared, in order that work which cannot usually be done without steam power may be accomplished by foot.  For instance, they will turn a 24 inch wheel or plate, or take a half-inch cut off a 3 inch shaft, much heavier work than can ordinarily be done by such tools.  They have 6 inch centers, gaps 71/2 inches wide and 61/2 inches deep, beds 4 feet 6 inches long by 83/4 inches on the face and 6 inches in depth, and weigh 14 cwt.  There are three speeds on the cone pulley, 9 inches, 6 inches, and 4 inches in diameter and 11/2 inches wide.  The gear wheels are 9/16 inch pitch and 11/2 inches wide on face.  The steel leading screw is 11/2 inches in diameter by 1/4 inch pitch.  Smaller sizes are made for torpedo boats and for places where space is limited.

[Illustration:  Lathe for use on shipboard.]

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The endless trough conveyer is one of the latest applications of link-belting, consisting primarily of a heavy chain belt carried over a pair of wheels, and in the intermediate space a truck on which the train runs.  This chain or belt is provided with pans which, as they overlap, form an endless trough.  Power being applied to revolve one of the wheels, the whole belt is thereby set in motion and at once becomes an endless trough conveyer.  The accompanying engraving illustrates a section of this conveyer.  A few of the pans are removed, to show the construction of the links; and above this a link and coupler are shown on a larger scale.  As will be seen, the link is provided

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Scientific American Supplement, No. 421, January 26, 1884 from Project Gutenberg. Public domain.
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