Parallel Rule

a device for uniform hatching, used in drafting. The principal elements of a parallel rule are a straightedge with a protractor attachment, a fastening yoke, a rod, and a shift lever with a return spring. When the lever on the rod is pressed, the rod carrying the yoke with the straightedge is moved by a predetermined step ranging from 0.2 to 10 mm. The yoke may be fastened at any point on the rod up to a distance of 100 mm. The protractor attachment has a stop that allows the straightedge to be set at an angle from 0° to 180°. Self-contained parallel rules are attachable to any spot on the drawing by means of pins; other types are made in unit with drafting machines.

单词	parallel rule
释义	Parallel Rule Parallel Rule a device for uniform hatching, used in drafting. The principal elements of a parallel rule are a straightedge with a protractor attachment, a fastening yoke, a rod, and a shift lever with a return spring. When the lever on the rod is pressed, the rod carrying the yoke with the straightedge is moved by a predetermined step ranging from 0.2 to 10 mm. The yoke may be fastened at any point on the rod up to a distance of 100 mm. The protractor attachment has a stop that allows the straightedge to be set at an angle from 0° to 180°. Self-contained parallel rules are attachable to any spot on the drawing by means of pins; other types are made in unit with drafting machines.
随便看	fine by me fine by (one) fine by one fine by (someone) fine by them fine by us fine by you fine-c finec fine china fine-coarse vector quantization fine control damper fine control law error detection finecorsa fine crackles fine crushed rock fine cut fine-cut fine(d) fined fine data rate adjustment fine dead fuel moisture fine defective structure fine delay fine design marine