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angle angle of incidence atmospheric atmospheric pressure axis battery body called cell centimetre coil compression concave conductor convex convex lens copper cubic cubic centimetre denote density dew-point direction distance dynes earth electricity electrified electromotive force employed energy equal equilibrium ergs expansion Find focal length friction galvanometer gases given glass grammes Hence horizontal immersed incident index of refraction iron lens lever Leyden jar light lines of force liquid machine magnet mass measured mechanical advantage mercury metals mirror mixture nearly needle negative normal object observed opposite parallel particle perature piece piston plane plate pole portion position pressure principal focus prism produced pulse quantity radius ratio resistance scale side sound specific heat substance surface telescope temperature thermal capacity thermometer tion tube unit vapour velocity velocity of sound vertical volume wave-length weight wire zinc
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 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...