 | Edward Spon - Engineering - 1874 - 460 pages
...intersection of the cross lines, may coincide wiik, imy given point on the plan. If the instrument is iu correct order, a line connecting the fine pricking...other would pass through the centre of the instrument, aa denoted by tlio before-mentioned intersection of the cross lines upon the glass, which, it may be... | |
 | John Fry Heather - Scientific apparatus and instruments - 1884 - 566 pages
...to make the necessary punctures in the paper. The branches,D, D,are attached to the index bars, 1,1, with a joint which admits of their being folded backwards...by the -before-mentioned intersection of the cross linos upon the glass, which, it may be observed, are drawn so nearly level with the under surface of... | |
 | Thomas Baker - Railroads - 1891 - 262 pages
...enables the person using it to place it so that the centre, or intersection of the cross lines, way coincide with any given point on the plan. If the...would pass through the centre of the instrument, as shewn by the intersection of the cross lines on the glass ; which it may be observed, are drawn so... | |
 | William Ezra Worthen - Architectural drawing - 1892 - 848 pages
...which enables the person using it to place it so that the center or intersection of the cross-lines may coincide with any given point on the plan. If...pricking points with each other would pass through the center of the instrument, as denoted by the before-mentioned intersection of the cross-lines upon the... | |
| |
The centre of the instrument is represented by the intersection of two lines drawn at right angles to each other on a piece of plate glass, which enables the person using it to place it, so that the centre, or intersection of the cross lines, may coincide... 
