Junior General Science |
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Popular passages
Page 328 - To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434. Approximately, we say that every foot elevation is equal to % Ib. pressure per square inch ; this allows for ordinary friction. To find the diameter of a pump cylinder...
Page 322 - Square Measure. 144 square inches 1 square foot, 9 square feet 1 square yard, 30J square yards 1 square rod, 40 square rods 1 rood, 4 roods 1 acre.
Page 321 - CUBIC MEASURE 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard...
Page 56 - Above the rest, the sun who never lies, Foretells the change of weather in the skies : For, if he rise unwilling to his race, Clouds on his brow, and spots upon his face, Or if through mists he shoots his sullen beams, Frugal of light, in loose and straggling streams, Suspect a drizzling day, with southern rain, Fatal to fruits and flocks, and promis'd grain.
Page 328 - To find diameter of a circle multiply circumference by .31831. To find area of a circle multiply square of diameter by .7854. To find area of a triangle multiply base by one-half perpendicular height.
Page 55 - A red flag with a black center indicates that a storm of marked violence is expected. The pennants displayed with the flags indicate the direction of the wind ; red. easterly (from northeast to south) ; white (westerly from southwest to north).
Page 44 - When the wind sets In from points between east and northeast and the barometer falls steadily a storm Is approaching from the south or southwest, and Its center will pass near or to the south or east of the observer within twelve to twenty-four hours, with wind shifting to northwest by way of north.
Page 323 - Troy Weight 24 grains = 1 pennyweight. 20 pennyweights = 1 ounce. 12 ounces = 1 pound.
Page 56 - After fine, clear weather, the first signs in the sky of a coming change are usually light streaks, curls, wisps, or mottled patches of white distant clouds, which increase, and are followed by an overcasting of murky vapor that grows into cloudiness. This appearance, more or less oily or watery, as wind or rain will prevail, is an infallible sign.
Page 321 - APOTHECARIES' WEIGHT 20 grains = 1 scruple. 3 scruples = 1 dram. 8 drams = 1 ounce. 12 ounces = 1 pound.