Device for spiralno lines are usually quite complex in design, can not be said about the method of its receipt. A circular boss fixed to prepared for the drawing surface; the wound on the boss thread, and the other end tied on pen or pencil — that’s all, “device”, which is clear from the figure.
Recommend to read
- THE TRAP SAWDUST
When drilling holes in vertical parts or concrete wall is not so easy to demonstrate the accuracy and not to make a mess. However, this method makes it easy to solve this problem. Take... - THE BOX-SET
Even the strongest domestic joiners, boldly undertake to produce on their own shelf, bedside table or Cabinet, do not always have the courage to venture more larger items: couch or sofa,...