utside of the rail AB and the lineCD. Draw A9 perpendicular to ABand CD, and divide it into nine equalparts. On the sixth division as a sidedraw the square ahc^. With centre aand radius aA draw the quadrant AE.With centre 6 and radius 6E draw arcEF. With centre c and radius cF drawFG; with centre 6… … Prob. 109.being given. To construct a spiral, its greatest diameter AB Divide AB into eight equal partsby points 1, 2, 3, etc. On 45 as adiameter draw a circle CDEF. Thiscircle is the eye of the spiral. In-scribe a square CDEF, as shown inthe enlarged drawing of the eye. Drawthe central diameters…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-255-160.webp)
