OCR Text |
Show To Mngnetize a Knife, Take a pocket or table knife and lay Its blade flat upon the back of a fira shovel. W ith a pair of tongs heldfimily la the hand rub tho blade vigorously and always in the same direction from point to base. Tarn the blade over now and then, so that tho friction may boap-! boap-! plied to both sides. After a robbing of j from forty to fifty seconds tho blade will ; be magnetized, and will be capable of lifting a needle with which it is placed ! in contact, point to point. The magnetization magnet-ization will last a long time. This experiment, ex-periment, which is not put down in works on physics, is very interesting and worthy of study. Nature. |