 ... placed by the maker equidistant from each other and parallel to the middle one — therefore, when the middle one is adjusted, the others are so too ; he also places the two transverse wires at right angles to the vertical middle wire. These adjustments...  New American Practical Navigator - Page 1481880Full view - About this book
 | Frederick Walter Simms - Astronomical instruments - 1834 - 124 pages
...angles to the vertical middle wire. These adjustments are always performed by the maker, and but little liable to derangement. When, however, they happen...remove the wires from the focus of the object-glass. The axis on which the telescope turns must next be set horizontal: to do this, apply the level to the... | |
 | Nathaniel Bowditch - 1846 - 854 pages
...but little liable to derangement. When, however, they happen to get out of order, and the observ« wishes to correct them, it is done by loosening the...remove the wires from the focus of the object-glass. To Jbc the axes or arms, upon which the telescope revolves, in a horizontal position, The axes on which... | |
 | Benjamin Pike - Science - 1848 - 356 pages
...angles to the vertical middle wire. These adjustments are always performed by the maker, and but little liable to derangement. When, however, they happen...remove the wires from the focus of the object-glass. The axis on which the telescope turns must next be set horizontal. To do this, apply the level to the... | |
 | Benjamin Pike (Jr.) - Scientific apparatus and instruments - 1848 - 482 pages
...angles to the vertical middle wire. These adjustments are always performed by the maker, and but little liable to derangement. When, however, they happen...remove the wires from the focus of the object-glass. The axis on which the telescope turns must next be set horizontal. To do this, apply the level to the... | |
 | John F. Heather - Scientific apparatus and instruments - 1849 - 208 pages
...examine whether the object is bisected by every part of the middle vertical wire ; and, if not, loosen the screws which hold the eye-end of the telescope in its place, and turn the end round very carefully till the error is removed. Lift the transit off the YS, and reverse... | |
 | Sir Henry Edward Landor Thuillier - Surveying - 1851 - 826 pages
...examine whether the object is bisected by every part of the middle vertical wire; and, if not, loosen the screws which hold the eye-end of the telescope in its place, and turn the end round very carefully till the error is removed. Lift the transit off the Y's, and reverse... | |
 | John Fry Heather - Angles (Geometry) - 1859 - 198 pages
...examine whether the object is bisected by every part of the middle vertical wire; and if not, loosen the screws which hold the eye-end of the telescope in its place, and turn the end round very carefully till the error is moved. Lift the transit off the Ys, and reverse... | |
 | John Fry Heather - Mathematical instruments - 1866 - 228 pages
...examine whether the object is bisected by every part of the middle vertical wire ; and if not, loosen the screws •which hold the eye-end of the telescope in its place, and turn the end round very carefully till the error is moved. Lift the transit off the Ys, and reverse... | |
 | George Frederick Chambers - Astronomy - 1867 - 888 pages
...to see whether the object still remains bisected in every part by the middle wire ; if not, loosen the screws which hold the eye-end of the telescope in its place, and turn the end round very carefully until the error is removed. Lift up the whole instrument bodily from... | |
 | George Frederick Chambers - Astronomy - 1877 - 968 pages
...to see whether the object still remains bisected in every part by the middle wire ; if not, loosen the screws which hold the eye-end of the telescope in its place, and turn the end round very carefully until the error is removed. Lift up the whole instrument bodily from... | |
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