Читать книгу The Modern Clock. A Study of Time Keeping Mechanism; Its Construction, Regulation and Repair онлайн

38 страница из 100

The following table of weights will be of use in making calculations for a pendulum or for clock weights.

Weight of Lead, Zinc and Cast Iron Cylinders One-Half Inch Long.

Diameter in Inches. Weight in Pounds. Lead Zinc Iron .25 .020 .012 .012 .5 .080 .049 .050 .75 .180 .111 .114 1. .321 .198 .204 1.25 .503 .310 .319 1.5 .724 .447 .459 1.75 .984 .607 .624 2. 1.287 .794 .816 2.25 1.630 1.005 1.033 2.5 2.009 2.239 1.274 2.75 2.434 1.502 1.544 3. 2.897 1.788 1.837 3.25 3.400 2.098 2.156 3.5 3.944 2.434 2.491 3.75 4.51 2.783 2.865 4. 5.149 3.177 3.265 4.25 5.813 3.587 3.686 4.5 6.519 3.922 4.134 4.75 7.265 4.483 4.607 5. 8.048 4.966 5.103 5.25 8.872 5.474 5.626 5.5 9.737 6.008 5.175 5.75 10.643 6.567 6.749 6. 11.590 7.152 7.350

Example:—Required, the weight of a lead pendulum bob, 3 inches diameter, 9 inches long, which has a hole through it .75 inch in diameter. The weight of a lead cylinder 3 inches diameter in the table is 2.897, which multiplied by 9 (the length given) = 26.07 lbs. Then the weight in the table of a cylinder .75 inch diameter is .18 and .18×9=1.62 lbs. And 26.07-1.62=24.45, the weight required in lbs.