It is convenient to create a temporary memo — whether it is preparing the card for your file, or just notes about the latest Affairs in the coming days, or envelopes with letters awaiting answer: they are placed between the turns of the springs (preferably of large diameter). Ensure that the spring does not ride, attach the ends of tin or cardboard cheeks.
Recommend to read
Micro motorcarts
Before introducing the material below, we’d like to recall a short note in issue No. 2 of our journal for 1979 — “Folding sleds.” The reason is that the author of both designs is the same...
WING — ON THE RISE
The peculiarity of the proposed model rocket class "Hawk" — the displacement of the wing at takeoff. As this increases the area of the tail section, shifting the center of pressure of...
