When working with pencil on wood or cardboard, the pencil lead wears out quickly. To reduce the abrasion of stylus, and increasing the strength of the sharpened part of the pencil need to dip the tip in a quick-drying lacquer: furniture NC, caponiac, potekla.
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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...
METAPHOR-“MUKHACHOV”
Perhaps this mechanism could be the easiest family of his brethren: even to schoolchildren by force if necessary, to raise and move it. Light weight and simplicity of manufacture — these...
