under these conditions, with water at $2.50 per thousand cubic feet? 41. Compute and fill in the omitted entries in the table below: 42. The first Zeppelin air-ship had the following proportions: Aluminum framework, 128 m. in length; Internal diameter, 11.3 m.; Total weight, about 102000 kilos; 2 Daimler 16 H.P. motors, weighing 450 kilos each; Consumption of benzine, .375 kilogram per horse-power hour; Capacity of tanks, 60 kilograms benzine. (1) Determine the dimensions of the framework in feet, (2) The weight in tons, (3) Total weight of motors in pounds, (4) Duration of run without replenishment of benzine. 43. By the amalgamation process of milling gold-bearing rock, 64687.7 oz. of gold were obtained from 57725 tons of ore at an expense of 10s. 1.2 d. per ton. (1) How much did the value of the gold exceed the cost of milling, in both English and U. S. money? (2) What was the troy weight of the gold and its metric weight in kilograms? (3) How many ounces of ore were required for 1 ounce of gold? 44. At the Paris Exposition of 1900, the boilers were required to furnish 600 kilograms of steam per hour per square meter of grate. The exhibitors received 4 francs per 1000 kilos of steam produced, the daily evaporative capacity being 1500000 kilograms. (1) Compute the number of pounds of steam required per hour per square foot of grate. (2) How much did the exhibitors receive for the steam produced per day, in French, English, and U. S. money? 45. A winding drum for hoisting ore from a shaft 220 meters deep is 224 cm. in diameter and 85 cm. long. The maximum speed of hoisting is 8.5 m. per second and the load is as follows: (1) Compute the dimensions of the drum in U. S. measure. (2) Compute the depth of the shaft in feet, (3) Compute the total load on the drum in U. S. tons, (4) Compute the speed in feet per minute, and the number of minutes required to hoist the load from the bottom to the top of the shaft. 46. The data below are taken from the Engineering Magazine for May, 1905. Compute and fill in the omitted entries. 47. The passenger locomotives, Type 10, on the Belgian State Railways, have the following specifications. Compute and fill in the omitted entries. 48. An air-compressor with a capacity of 7000 liters per minute, forces air into two reservoirs having a combined capacity of 142 cu.ft., the pressure maintained in the reservoirs being 94 lbs. per square inch. Compute the capacity of each reservoir in liters and the pressure in kilograms per square centimeter. 49. The table below gives the length of the three lines of the Berlin Elevated and Underground Railway, and the running time on each. Compute and fill in the omitted entries. CHAPTER V MEASURING INSTRUMENTS SECTION 1. THE MICROMETER. SECTION 2. THE VERNIER CALIPER. SECTION 3. THE PLANIMETER § 1. THE MICROMETER 99. Description. The instruments commonly used for precise measurements in the shop are gages and calipers. Of all these instruments in their various forms, only two require explanation. These are the micrometer and the vernier calipers. As the name indicates, the micrometer is an instrument which is used in taking small measurements, "micro" meaning small and "meter" meaning measure. The instruments in the form here shown are made in -, 1-inch, 2-inch, and 3-inch sizes, the size being the opening between the spindle and the anvil. They are graduated both in U. S. and metric units, but the two are not combined in the same instrument owing to the difference in the screw. The parts of a micrometer are named as follows: F, the frame, A, the anvil, S, the spindle, B, the hub or barrel, T, the thimble. The spindle is attached to the thimble at the point P. The concealed portion of the spindle within the sleeve and |