In homes today, it is used quite a lot of galvanic power sources (batteries). Even the most “long-playing”-of them at the end of life just thrown away, though their metal body remains as entire as at first. If you take it apart, it would make a great ring to strengthen the wooden handles of files, needle files, awls, cutters for turning operations on a tree.
A. PISKUNOV, S. L o V C s. Moscow region
Recommend to read
EAGLET, HAVE NOT HAD TIME TO GROW UP
at the beginning of last century, the pilots noticed that the landing of the aircraft when the height was commensurate with the chord of his wing, there is an additional lifting force,...
Gas TANK
For works in chemical laboratory hydrogen is produced usually by the reaction of zinc with hydrochloric acid (HCL). Sometimes you need a small amount of gas, and 1 g of zinc makes about...
