from The Century Dictionary.
- noun An instrument for drawing lines converging toward a point, though the point be inaccessible.
from the GNU version of the Collaborative International Dictionary of English.
- noun An instrument for drawing lines through a point, or lines converging to a center.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An
instrumentfor drawing linesthrough a point, or lines convergingto a centre.
Sorry, no etymologies found.
This is a repetition of the previous problem, or rather the application of it to architecture, although when there are many details it may be more convenient to use vanishing points or the centrolinead.
_ -- When this vanishing point is a long way outside the picture, the architects make use of a centrolinead, and the painters fix a long string at the required point, and get their perspective lines by that means, which is very inconvenient.
The architects in such cases make use of the centrolinead, a clever mechanical contrivance for getting over the difficulty of the far-off vanishing point, but by the method I have shown you, and shall further illustrate, you will find that you can dispense with all this trouble, and do all your perspective either inside the picture or on a very small margin outside it.