Word: electro-magnetism
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...cyclotron of Ernest Orlando Lawrence neatly finesses such troubles by making a comparatively small voltage act on a particle repeatedly until it attains a speed corresponding to extremely high voltage, thus dispensing with a discharge tube altogether. Most conspicuous feature of the apparatus is an 85-ton electro-magnet whose poles face each other vertically across an 8-in. gap. In the gap is placed a shallow cylindrical tank, pumped out to a high vacuum so that particles inside may move freely without interference from air molecules. Ions such as deuterons (nuclei of heavy hydrogen...
...system of putting through a dial telephone call is as follows: For each of the first three letters of the called exchange name, and for the four figures of the number and the letter of the party line, the caller turns the dial. Each dial turn actuates a delicate electro-magnet at the automatic exchange. If the call is to another dial call, the automatic exchange mechanically connects the call with the proper exchange, number and party, rings insistently. If the dial call is to a manual telephone, the automatic exchange mechanically registers the called number on the big board...
...hear is close to 30,000 a second.) And just as a radio amateur can make a cheap receiving set squeal by moving his hand about the unprotected parts and thus altering the electrical tension of the whole set, just so Professor Theremin altered the electro tension of the electro-magnet fields within his box. The precision with which he built his contrivance permitted him to extract, not amateur squeals, but harmonious musical sounds. (Gestures with his left hand about the horizontal ring were the equivalent of turning the amplifying knob of a receiving...
Died. William Merrick Sweet, 66, eye surgeon; in Philadelphia, of pneumonia. He experimented successfully with plastic surgery on the eyeball, devised a method of using x-rays to locate foreign bodies in eyes, but gained best repute for the electro-magnet he invented in 1905 to pull iron and steel splinters from eyes...
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