 ... reflected from, the object. 2. Delicate observations should not be made when the fluid which lubricates the cornea is in a viscid state. 3. The best position for microscopical observations, is when the observer is lying horizontally on his back. This...  Pneumatics, electricity, magnetism, and optics - Page 322by Denison Olmsted - 1835Full view - About this book
 | Edinburgh encyclopaedia - 1830 - 856 pages
...portion of it which is transmitted through, or reflected from the object 2. Delicate microscopical observations should not be made when the fluid which lubricates the cornea of the observer's eye happens to be in a viscid state, which is frequently the case. See Brande's Journal,... | |
 | David Brewster, Alexander Dallas Bache - 1833 - 674 pages
...proceeds from the illuminating centre, excepting what is transmitted through or reflected from the object. 2. Delicate observations should not be made when the...which lubricates the cornea is in a viscid state. 8. The best position for microscopical observations is when the observer is lying horizontally on his... | |
 | David Brewster - 1837 - 432 pages
...proceeds from the illuminating centre, excepting what is transmitted through or reflected from the object. 2. Delicate observations should not be made when the...best position for microscopical observations is when * See KilMarpk Journal of Science, No. IV. new series, p. 321. the observer is lying horizontally on... | |
 | David Brewster - 1841 - 432 pages
...proceeds from the illuminating centre, excepting what is transmitted through or reflected from the object 2. Delicate observations should not be made when the...best position for microscopical observations is when * See FMnhurfh Journal of Science, No. IV. new >eriei, p. 321. the observer is lying horizontally on... | |
 | Denison Olmsted - 1844 - 610 pages
...from the illuminating body, excepting what is transmitted through, or is reflected from, the object. 2. Delicate observations should not be made when the...The worst of all positions is that in which we look downward vertically. 4. If we stand straight up and look horizontally, parallel markings or lines will... | |
 | John Quekett - 1848 - 544 pages
...light, except that which is transmitted through or reflected from the object. 2. Delicate microscopical observations should not be made when the fluid which lubricates the cornea of the observer's eye happens to be in a viscid state, which is frequently the case. 3. The figure... | |
 | Joseph Henry Wythe - 1851 - 206 pages
...when the observer is lying horizontally on his back. This arises from the perfect stability of the head, and from the equality of the lubricating film...positions is that in which we look downwards vertically. The most common and easy position is generally with the instrument inclined at an angle of 45 degrees.... | |
 | Thomas Dick - 1851 - 202 pages
...any but what is transmitted through or reflected from the object. 5. According to sir D. Brewster, the best position for microscopical observations is...observer is lying horizontally on his back. This, he says, arises from the perfect stability of his head, and from the equality of the lubricating film... | |
 | Joseph Henry Wythe - 1851 - 204 pages
...the object.— This rule will illustrate the use of the diaphragm under the stage of the microscope. 2. Delicate observations should not be made when the fluid which lubricates the cornea of the eye is in a viscid state. 3. The best position for microscopic observations is when the observer... | |
 | Joseph Henry Wythe - 1852 - 208 pages
...the object. — This rule will illustrate the use of the diaphragm under the stage of the microscope. 2. Delicate observations should not be made when the fluid which lubricates the cornea of the eye is in a viscid state. 3. The best position for microscopic observations is when the observer... | |
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