Science for Beginners |
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Popular passages
Page 479 - 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 104 - Explain why this is so (see Art. 22). 132. Application of Charles' Law. — It is not probable that in any two lamps we might examine we should find that the gases within the chimney are heated to exactly the same temperature. But we are probably not far from the truth if we say that the gases within the ordinary lamp chimney are so heated that they are expanded to twice the volume they had when they entered the bottom of the burner. Every cubic inch of air which enters the burner leaves the top...
Page 517 - SQUARE MEASURE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet — 1 square yard (sq. yd.) 30^ square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq.
Page 517 - 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 518 - 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 68 - The mug of cider simmered slow, The apples sputtered in a row, And, close at hand, the basket stood With nuts from brown October's wood. What matter how the night behaved ? What matter how the north- wind raved ? Blow high, blow low, not all its snow Could quench our hearth-fire's ruddy glow.
Page 139 - 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 276 - 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.
Page 481 - The Law of Machines. — The work (or energy, see Art. 85) put into a machine and also the work (or energy) taken out of a machine must, of course, be measured in work units, ie, in such units as foot-pounds, or gram-centimeters, or kilogram-meters. The work put into a machine is equal to the product of the applied force and the distance through which that force acts; the work delivered by a machine equals the product of the force delivered and the distance through which it acts. If there were no...
Page 307 - Vaccination in infancy, renewed at the end of childhood, renders an individual practically as safe from death from smallpox as if that disease had been survived in childhood, and almost as safe from an attack. A recent successful vaccination is a positive protection against an attack.
Bibliographic information
| Title | Science for Beginners |
| Authors | Frederic Delos Barber, Merton Leonard Fuller, John Lossen Pricer, Howard William Adams |
| Publisher | H. Holt, 1921 |
| Original from | Harvard University |
| Digitized | 9 Mar 2007 |
| Length | 537 pages |
| Export Citation | BiBTeX EndNote RefMan |