Synopsis
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. 1905 Excerpt: ...123 i. The barometer is an instrument for measuring pressure. The pressure on the surface, S, shown in the picture, forces the mercury up the tube, T. The scale in the picture shows how high the mercury stands in the tube. How many inches high does it stand? 2. If the cross-section of the tube is 1 sq. in., the volume of the mercury in 1 inch of the tube is 1 cu. in.; how many cubic inches of mercury are there in the tube? 3. 1 cu. in. of water weighs.58 oz.; what is the weight of 30 cu. in.? 4. A quantity of mercury is 13.6 as heavy as an equal quantity of water; what is the weight of 30 cu. in. of mercury? Express the result to the nearest pound. 5. What causes the mercury in the barometer to rise and fall? What is the air-pressure per square inch? When the mercury rises gradually it is a general indication of fair weather. When it falls rapidly it indicates rain or snow. 6. Read the weather report. How THE WEATHER. THERMOMETER IN NEW YORK. January 2, 1003. January 2, 1004. 8A.M. 12 M. 2:80 P.M. 30 42 8 A.M. 19 10 A.M. 18 12 M. 18 BAROMETER IN NEW YORK. 8 A. M....S0.03;lOA. M 20.09 1 12 M...29.92 LOCAL, FORECAST. UNITED STATES WEATHER BUREAU. NEW YORK. January 2.--For New York and vicinity: Snow to-night. Sunday generally fair and colder; brisk to high northeast to north winds, shifting to northwest Sunday. do the barometer readings indicate snow or a storm? What is the average of these readings? 124 PROBLEMS--TIME-CARDS Plan the solution and make the computation: i. If 8 hours of labor are understood to constitute a day's work and a workman receives $1.50 a day on this basis, how much does he receive for 36 hours' work? How much does he receive per hour? For 3 hours' work? Note.--Fractional parts of a cent should be omitted from the results. 2. On the ba...
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