Journal of the Franklin Institute, Հատոր 188Franklin Institute, 1919 Vols. 1-69 include more or less complete patent reports of the U. S. Patent Office for years 1825-1859. cf. Index to v. 1-120 of the Journal, p. [415] |
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Էջ 489 - It is impossible for a self-acting machine, unaided by any external agency, to convey heat from one body to another at a higher temperature ; or heat cannot of itself (that is, without compensation) pass from a colder to a warmer body.
Էջ 788 - Hence the surface was early frozen. Hence the first snows remained on it unmelted, and received continual additions. Hence perhaps the winter of 1783-4, was more severe than any that had happened for many years.
Էջ 805 - ... the dustiness of the earth's atmosphere, but also upon the dustiness, and, of course, the temperature, of the solar atmosphere. Obviously, dust in the sun's envelope must, more or less, shut in solar radiation just as, and in the same manner that, dust in the earth's 1C.
Էջ 464 - SABCE be the path of a ray in this plane, entering the drop at A and emerging at C. The changes in direction at A and C are each i — r, in which i is the angle of incidence and r the angle of refraction, and the change at B, as also at every other place of an internal reflection, when there are more than one, is «• — 2r.
Էջ 788 - ... summer fogs. Because, if found to be so, men might from such fogs conjecture the probability of a succeeding hard winter, and of the damage to be expected by the breaking up of frozen rivers in the spring; and take such measures as are possible and practicable to secure themselves and effects from the mischiefs that attend the...
Էջ 690 - However, it appears that the temperature at which Illinois coal should be handled for the production of the best coke is somewhat lower than the best operating temperatures for Eastern coals, and moreover, the speed of coking of the Illinois coal is somewhat less.
Էջ 366 - The coefficient of reflection or total reflecting power of a surface is defined as the ratio of the total reflected luminous flux to the total incident luminous flux. In most practical work this value is not of great importance, the value desired being that of the reflecting power of the surface measured under certain specified conditions, such as the angle of incidence of the flux and the position from which the surface is viewed. The term '* reflection factor...
Էջ 289 - OF THE FRANKLIN INSTITUTE OF THE STATE OF PENNSYLVANIA. FOR THE PROMOTION OF THE MECHANIC ARTS. VOL.