RADIOGRAMS

Shannon News, 20 December 1927, Page 2

RADIOGRAMS

in • taking hydrometer readings of vour wet A battery always be careful to return the. liquid .taken out by the hydrometer to the same cell it was. taken from. Failure to replace the liquid in the same cell from which it was * draw n will result in destroying tlu: uniformity of the celts. For ininstance, if the acid has been draun from cell A and discharged into cell B, the amount taken must later be made up by adding water, and the acid in cell A "will be that much weaker, while that in cell B will be corres pondingly stronger. On some crystals, only a slight con tact of vlie cat’s whisker is needed, Galena and silicon are of this kind. [ro n pyrites makes a firm heavy con | tact. Using carborundum, the point of the cat’s whisker; can even be ■'jibbed under the surface of the crystal. Phonograph needles are excellent for use with a carborundum crystal.

Transformers must be kept well apart and the cores should be at right angles, .although with tho shielded type this is not nearly as necessary as with the earlier open type. A whistle in an audio frequency transformer can- bo traced to several things, including transformers too close together and wires in these circuits being pfiaeed parallel. Incorrect connections to the audio frequency transformers will canscj trouble even through they have been .wired according to the markings on the transformers. Connecting the cores of the transformers together and earthing them will often overcome an elusive whistle.

Never run the lead-in any. long distance through % your house. Once .inside the house the lead-in should be as short as possible. If the' lead-in is long inside the- house, the walls and ceilings will absorb most of the radio-frequency energy that should flow into the receiving set. In other words, strength of reception will be greatly reduced. Place your receiving set near the point where the lead-in enters the house.

Any attractive entertainment that holds public taste must have novelties, and-it is through the. absence of these that radio programmes in New' Zealand are likely to lose their interest. Some of the best brains in the world of amusement are secured by radio services in other parts to provide these essential novelties. In this corner of the earth we may have our own proportionate share of these brains, but We they being, used? From a wireless point of view, Chicago may pride herself on being the noisest place on earth. The U.S. Ninth Radio District, with Chicago .as its 'headquarters, contains 233 active broadcasting stations out of a total of <594 throughout the States.