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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HOMEMADE FORGE
due to numerous requests of our readers interested in the publications under this title (see No. 8, 1977, No. 5, 1978), put some more descriptions of decorative designs, metal and wood...
ROCKET J. HAROLD
At the world Cup 1978, held in the city of Yambol (Bulgaria) in the class RC raketoplana S-4-D (the maximum mass of 240 g, the total impulse of the propulsion system 10-40 n*s) a...
