First Course in General Science |
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Popular passages
Page 543 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 391 - England, it was not until the latter half of the nineteenth century that the double standard was abolished.
Page 583 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq.
Page 584 - TIME 60 seconds (sec.) = 1 minute (min.) 60 minutes = 1 hour (hr.) 24 hours = 1 day (da.) 7 days = 1 week (wk.) 365 days = 1 common year...
Page 416 - The dominating theory of disease was the humoral, which has never since ceased to influence medical thought and practice. According to this celebrated theory the body contains four humors — blood, phlegm, yellow bile, and black bile — a right proportion and mixture of which constitute health; improper proportion and irregular distribution, disease.
Page 191 - To explain the construction of the common barometer, and to shew that the mercury is sustained in it by the pressure of the air on the surface of the mercury in the basin.
Page 583 - CUBIC MEASURE 1728 cubic inches (cu. in.) = 1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...
Page 583 - Weight. 16 drams (dr.) = 1 ounce (oz.). 16 ounces — 1 pound (Ib.). 100 pounds — 1 hundredweight (cwt.). .2000 pounds - 1 ton (t.).
Page 122 - But we are probably not far from the truth if we say that...
Page 391 - I saw with wonder that my material contained many tiny animals which moved about in a most amusing fashion; the largest of these (A, Fig. 1) showed the liveliest and most active motion, moving through the water or saliva as a fish of prey darts through the sea; they were found everywhere, although not in large numbers.