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Radio Record, Volume I, Issue 30, 10 February 1928, Page 13

A correspondent points ont that the gravity type of Daniel ‘cell will work quite well with a 1 to 80 solution of sulphuric acid and water. A correspondent asks for advice regarding the use of a kite to hold a vertical aerial. This is an early and primitive method of getting a wire skywards. Marconi used small balloons

for the purpose in early attempts, Under modern conditions a kite aerial cannot he more than an experiment, and would be just about as unreliable as possible, and the best advice is to leave it alone and put the money into a pair of good high poles. A Christchurch correspondent inquizes about the possibility of an amateur constructing a bar amplifier. Depends upon the constructor’s capabili-ties-failing considerable experience in construction, this is best left alone. It is estimated that upon a basis of five persons to each receiver, 90 million people at present listen-in. This represents 9 per cent. of the total populatien in zones which to-day enjoy a reliable broadcasting servize, "Megohm" does not claiin "perfect" reception for the amplifier recently described, althongh that word inadvertently appeared in the heading. However, the set is one that will give highlysatisfactory results if proper care is taken in construction. "FPuzzied’ (Ohakune), (no naime).Call at P.O. for letter. The latest type of Brandes variable condenser impresses one as a well-con-structed piece of apparatus, precision, and finish being at cnce apparent. A four-inch bakelite dial carries the scale, and the central knob actuates a 60 to 1; vernier with milled friction drive, giving perfectly smooth action free from any’ suspicion of backlash. A shipment of , these in two values, .0005 and .0003, , has just been landed by the Interna-' tional Radio Co., Itd., Wellington,