Among the walnuts come across so strong to cope with them is possible only with a hammer; but often while the kernel itself is flattened into a pancake. If you have a bench clamp, use — before the onslaught none can resist the tough nut to crack!
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THE INDICATOR OF BURNING OF A FUSE
That fuse in the radio, will alert you to the simple automatic device, scheme of which was published the magazine "Radio Fernsehen Elektronik" (Germany). While a fuse F1 (see figure),...
THE MACHINE CALLS
In most of our schools calls still include the old — fashioned way of push-button attendant or watchman. But this process is not difficult to automate. Proposed device designed for this...
