This simple device facilitates the use of any tube, helping to squeeze it evenly and gently. It consists of a base in a hole which is inserted the tube, and turning a key with slit for exciting a planar end of the tube. The base and key are made of wooden bars of appropriate dimensions. Their interaction is clear from the figure.
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TWO CLOTHESPINS
privernuty screws to a wooden cube, to help you quickly and accurately to solder the two conductors.
THE SECOND “LIFE” OF BEACON
Flashing beacons are used in electronic home security systems and in cars as devices of indication, alarm and warning. Moreover, their appearance and "stuffing" are often not...
