Now, almost everywhere applied electronic machines and appliances, the programme of work which is carried out by using perforated paper tapes and cards. Therefore, it is easy from already used punch cards to pick up where the holes were located in one row. Essentially, this is a ready device for drawing dashes: apply to the centers of the holes, a ruler and a pencil or pen — under the card will remain clear dotted line.
Recommend to read
THREAD IN A THIN SHEET
Usually designers avoid threaded joints if at the conventional "nut" less than two to three threads. Method shown in figure, allows you to make a threaded connection more reliable....
SCREW PLUS BAR…
...make a surface gauge. In the block of hard wood drilled a hole in which is screwed into the screw. Use a screwdriver to set the distance required for the application of risks. ...
