 | Sir Richard Phillips - Celestial mechanics - 1811 - 196 pages
...dividing the focal distance of the object-glass by the focal distance of one ot the eye-glasses. 275. The camera obscura is made by fixing a convex glass...on a white paper placed in the focus of the lens. 276. If the convex lens be placed in a tube in the inside of a box, within which is a looking glass... | |
 | Sir Richard Phillips - Physics - 1826 - 236 pages
...of crown aod flint object-glasses, destroys the colours which arise in any single object-glass. 198. The Camera Obscura is made by fixing a convex glass...shutter, and, if no light enters the room but through the glass,the pictures of all obj ects on the outside may be seen in an inverted position on a white paper... | |
 | Sir Richard Phillips - Physics - 1826 - 254 pages
...of crown and flint object-glasses, destroys the colours which arise in any single object-glass. 198. The Camera Obscura is made by fixing a convex glass...window shutter, and, if no light enters the room but throughtheglass,the pictures of all objects on the outside may be seen in an inverted position on a... | |
 | Mrs. Marcet (Jane Haldimand), John Lauris Blake - Astronomy - 1826 - 308 pages
...fire. CAMER A-OBSCURA, in opticks, a ma'•hine representing an artificial eye. It 13 made by placing a convex glass in a hole of a window shutter, and if no light enters Uie room but through the glass, the pictures of all objects on the outside maybe distinctly seen in... | |
 | Mrs. Marcet (Jane Haldimand) - Astronomy - 1829 - 312 pages
...on fire. CAMERA-OBSCURA, in opticks, a machine representing an artificial eye. It is made by placing a convex glass in a hole of a window shutter, and if no light enters the room hut through the glass, the pictures of all objects on the outside may be distinctly seen in an inverted... | |
 | John Lee Comstock, Richard Dennis Hoblyn - Physics - 1846 - 148 pages
...OBSCURA. Literally, a dark chamber. It is made by placing a convex glass in a hole of a windowshutter; and, if no light enters the room but through the glass, the pictures of all objects on the outside may b« distinctly seen in an inverted position, on any white surface placed at the focus ui the lens.... | |
 | John Lee COMSTOCK (and HOBLYN (Richard Dennis)), John Lee COMSTOCK - 1846 - 506 pages
...OBSCURA. Literally, a dark chamber. It is made by placing a convex glass in a hole of a windowshutter ; and, if no light enters the room but through the glass, the pictures oi all objects on the outside may be distinctly seen iu an inverted position, on any white surface... | |
 | Benjamin Pike - Medical instruments and apparatus - 1848 - 372 pages
...constructed in the following manner : fix a convex lens, from one to three inches diameter, in the hole of a window shutter, and if no light enters the...the outside may be seen in an inverted position on a sheet of white paper placed at the focus of the glass, or at such a distance from it as they may be... | |
 | Benjamin Pike - Mathematical instruments - 1848 - 360 pages
...constructed in the following manner : fix a convex lens, from one to three inches diameter, in the hole of a window shutter, and if no light enters the...the outside may be seen in an inverted position on a sheet of white paper placed at the focus of the glass, or at such a distance from it as they may be... | |
| |
It is made by placing a convex glass in a hole of a window shutter, and if no light enters the room but through the glass, the pictures of all objects on the outside may be distinctly seen in an inverted position, on any white surface placed at the focus... 