
Plastic body ball point pen is often broken, especially at the tip, near the writing unit. Operational offer a way out: to tighten tight the rod in a paper tube, taped the edge of the strand. This “ball” will serve to securely purchase the new.
N. ALIKIN, St. P etersburg
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ANY CLEAVAGE
be easily treated with sandpaper, if you use this wooden rod of suitable diameter. The operation is performed through wrapped around it a piece of sandpaper required granularity.
ACOUSTIC PROBE
The magazine "Amaterske Radio" (Czechoslovakia) proposed scheme is a simple audio probe to detect logic levels; low (logic 0) and high (logical 1). The device consists of a bitonal...