If a wooden bar and drill two holes the diameter of pencils or flomasterom — get a new handy tool for drawing or sketching: one motion will be two parallel lines. Instead of a single bar it is possible to use two longitudinal halves, in which to choose the grooves for writing the stems and then tie or glue the workpiece.
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PROTOTYPE -HOURGLASS
The Romanian magazine "Technium" offers a diagram of the electronic timer operates on the principle of the 5-minute hourglass clock every minute. The indication to carry out the LEDs....
Mill in the yard
Those who keep livestock and poultry in their household cannot do without grain supplies.
Grain can be stored for a long time (I read in one of the magazines that an amphora with wheat...
