AERIALISMS

Sun (Auckland), Volume IV, Issue 965, 7 May 1930, Page 7

AERIALISMS

The 2FC and 2BL Hospital Birthday League has now raised £l2O iu It weeks in subscriptions of 2s 6d from children's "birthday” calls.” Two children's hospital cots have now been paid for by the fund. A large number of the half-crowns are not given by the parents, but represent the savings of the children, who are anxious to help those less fortunate than themselves. A radio dealer in New York advertises an offer to “radiofy” any desk drawer, bookcase, magazine rack, cupboard. cabiuet, or other piece of sunable furniture at a cost complete of not over 125 dollars ( £2s*. The offer includes the sending of a skilled radio engineer to people's houses in orde * to give advice of how "lovely things in your home eau be used to bouse concealed radio.”

The fact that one valve is silvercoated inside and another is not. s» no guide to the efficiency of either valve. Tile silver covering on the inside of a valve is an incidental part of the process used to eliminate the gases from the high vacuum made by pumping the valves at the time of manufacture. A chemical substance is introduced into this valve during its assembling, and when the valve is electrically bombarded the chemical changes its character and becomes a silver coating on the inside of the valve. Certain types of valves ge' this more than others. The silver coating is more prevalent on th** battery operated 201 A valves than any other.