 | James Ferguson, Sir David Brewster - Astronomy - 1806 - 506 pages
...together in its focus, the force of all their heat is collected into that part; and is in proportion to the common heat of the sun, as the area of the glass is to the area of the focus. 8 Hence we see the reason why a convex glass causes the sun's rays to burn after passing through it.... | |
 | Sir Richard Phillips - Electricity - 1807 - 212 pages
...portion. 213. All the rays of the sun which pass through a convex glass, are collected in its focus. 214. The force of the heat at the focus is to the common...the area of the glass is to the area of the focus. the wage will not be more than one tenth of an incfc ill liiBiftrr, the surface of thi* little circle... | |
 | John Ewing - Astronomy - 1809 - 672 pages
...space is, into which they are condensed at the focus, the more intense will be the heat, which will be to the common heat of the sun, as the area of the glass is to the area of the solar image. For the common heat of the sun is the heat of the rays when they are spread over the surface... | |
 | Edward Augustus Kendall - Encyclopedias and dictionaries - 1811 - 516 pages
...whlcfi pass through a cunve* glass, are collected in its focus. The force of the hiiat at the loons is to the common heat of the sun, as the area of the glass is to the area of the focns. If a tens font inches in diameter collect the sun'S rays hito a footn at the distance of 12... | |
 | James Ferguson - Astronomy - 1814 - 420 pages
...together in its focus, the force of all their heat is col lected into that part; anil is in proportion to the common heat of the sun, as the area of the glasg is to the area of the focus.* Hence we see the reason why a convex glass causes the sun's rays... | |
 | Jeremiah Joyce - Science - 1815 - 468 pages
...which is collected in the focus ? Tutor. The force of the heat collected the focus is in proportion to the common heat of the sun, as the area of the glass is to the area of the focus : of course, it may, be a or even a thousand times greater it case than in the other. •s. Have I... | |
 | William Shepherd, Jeremiah Joyce, Lant Carpenter - Education - 1817 - 612 pages
...their heat rs collected into that part, and is in proportion to the common heat of the sun's rays, as the area of the glass is -to the area of the focus. As the one may be 10, or 100, or 1000 times larger than the other, the heat at the focus may be 10... | |
 | William Shepherd, Jeremiah Joyce, Lant Carpenter - Education, Higher - 1822 - 638 pages
...their heat is collected into that part, and is in proportion to the common heat of the sun's rays, as the area of the glass is to the area of the focus. As the one may be 10, or 100, or 1000 times larger than the other, the heat at the focus may be 10... | |
 | Alexander Watt (of Jamaica.) - Eye - 1825 - 102 pages
...parallel rays of the sun which pass through a convex lens as DR, or ca, are collected in its focus f orC, and the force of • the heat at the focus is to the...the area of the glass is to the area of the focus. " Illust. : If a lens four inches in. diameter collect the sun's rays into a focus at the distance... | |
 | Sir Richard Phillips - Physics - 1826 - 236 pages
...the parallel rays of the sun which pass through a convex glass as DE, are collected in its focus f and the force of the heat at the focus is to the common...the area of the glass is to the area of the focus. Tituf. If a lens four inches in diameter collect the sun's rays into a focus at the distance of twelve... | |
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and the force of the heat at the focus is to the common heat of the sun, as the area of the glass is to the area of the focus. Illustration. If a lens four inches in diameter collect the 
