The Engineers' Manual of the Local Marine Examinations

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...at the same point of the stroke. As the rules for determining the relations between the lap of the valve and the amount of expansion are difficult to be worked out by persons unacquainted with trigonometry, it will be convenient to collect the principal results into tables, which may be applied without difficulty to the solution of any particular example. This accordingly has been done in the three following tables, the mode of using which it will now be proper to explain. PROPORTION OF LAP REQUIRED TO ACCOMPLISH VARIOUS DEGREES OF EXPANSION. Example.--In the first line of the table will be found eight different parts of the stroke of the piston designated, and directly below each, in the second line, is given the quantity of lap requisite to cause the steam to be cut off at The Engineer Cadet, by Long and Buel. that particular part of the stroke. The different amounts of the lap are given in the second line in decimal parts of the length of the stroke of the valve; so that, to get the quantity of lap corresponding to any of the given degrees of expansion, it is only necessary to take the decimal in the second Jine, which stands under the fraction in the first, that denotes the degree of expansion, and multiply that decimal by the length we intend to make the stroke of the valve. Thus, suppose we have an engine in which we wish to have the steam cut off when the piston is a quarter of the length of its stroke from the end of it, we look in the first line of the table, and we shall find in the third column from the left, . Directly under that, in the second line, we have the decimal "250. Suppose that we consider 18 inches will be a convenient length for the stroke of the valve, we multiply the decimal "250 by 18, which gives 4J. Hence we...show more

Product details

• Paperback | 174 pages
• 189 x 246 x 9mm | 322g
• Miami Fl, United States
• English
• black & white illustrations
• 1236591704
• 9781236591708