In the box with old jewelry always find a ring with the fallen from the rim of the stone—put is a piece of school bands. It can be pre-processed, giving a conical shape that allows you to erase the unnecessary line without affecting the neighboring. The usability of such an eraser is obvious: it is not something that is always at hand — right at hand, not lost, and does not interfere with work.
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The AIRBOAT
In front of you a drawing of a simple model with electric motor and propeller. The real boats of this type are used in shallow rivers where conventional marine propeller can be damaged....
THYRISTOR VOLTAGE REGULATOR
My thyristor voltage regulator (THREE) is easy in manufacture and adjustment, linearity regulation and high power output — 200 watts without heatsink and 1000 watt radiator cooling area...
