Elementary text-book of physics

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Blackie, 1877 - 314 pages
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Page 26 - ... portions jointly support the weight. The cord which supports the next pulley is stretched with a force half of this, or a quarter of the weight; and the next cord with a force half of this, or an eighth of the weight; but this cord is directly attached to the power. Thus the power is an eighth of the weight, or the mechanical advantage is 8. If the weight and the block1 to which it is attached rise 1 inch, the next block rises 2 inches, the next 4, and the power moves through 8 inches. Thus,...
Page 69 - The height of the mercury in the tube above that in the cistern measures the difference between the pressure in the receiver and that in the external air.
Page 206 - Polarization by Reflection. — Transmission through tourmaline is only one of several ways in which light can be polarized. When a beam of light is reflected from a polished surface of glass, wood, ivory, leather, or any other non-metallic substance, at an angle of from 50 to 60 with the normal, it is more or less polarized, and in like manner a reflector composed of any of these substances may be employed as an analyser. In so using it, it should be rotated about an axis parallel to the incident...
Page 142 - The angle which the incident ray makes with the normal at the point of incidence is called the angle of incidence, and the plane of this angle is the plane of incidence.

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