| David Brewster, Alexander Dallas Bache - 1833 - 95 pages
...lens, when the eye views, at the distance of 6 inches, the image formed by the lens, is as follows. **From the distance between the image and the object in feet, subtract the** local distance of the lens in feet, and divide the remainder by the same focal distance. By this quotient... | |
| William Chambers, Robert Chambers - 1842
...distance, is, according to Sir David Brewster, as follow» :— " From the distance between the image and **object in feet, subtract the focal distance of the lens in feet,** »ni divide the remainder by the same focal distance. By this quotient divide twice the distance of... | |
| David Brewster - 1845 - 95 pages
...lens, when the eye views, at the distance of 6 inches, the image formed by the lens, is as follows. **From the distance between the image and the object...focal distance of the lens in feet, and divide the** remamder by the same focal distance. By this quotient divide twice the distance of the object in feet,... | |
| Marcus Sparling - 1856 - 212 pages
...distance, is, according to Sir David Brewster, as follows :— " From the distance between the image and **object in feet, subtract the focal distance of the...of times that the apparent magnitude of the object** it increased. When the focal length of the lens is quite inconsiderable, compared with the distance... | |
| William Somerville Orr - 1856
...distance, is, according to Sir David Brewster, as follows :— " From the distance between the image and **object in feet, subtract the focal distance of the...the object in feet, and the new quotient will be the** magni- [ fying power, or the number of times that the apparent magnitude of the object is increased.... | |
| |