Page 2 Advertisement 1

Radio Record, Volume II, Issue 22, 14 December 1928, Page 2

WILSONS CRYSTAL BAR AMPLIFIER The Wilson s Crystal Bar Amplifier is an ingenious instrument; especially designed to enable the Orystal Set owner to operate a Loud Speaker: The principle involved in this device is one which has been satis-. factorily employed for many years past in the World s greatest Telephone and Telegraph serviees, and is nOw adapted for use in Radio Reception for the first time. To operate this instrument it is only necessary to connect one pair of terminals to a 3-volt Dry Battery, the second pair to the Loud Speaker; and tbe loose leads supplied to the phone terminals of the Set: There are no delicate parts to get out 0f. order and the only adjustment necessary is made by a small black knob indicated in the illustration; To anyone requiring a simple and eflicient Ampli- fer; the Wilson Orystal Bar Amplifier can be highly recommended aS being capable Of giving thoroughly satisfactory service under all conditions. On account of mass production, these are now offering at greatly reduced prices: Obtainable from all responsible . Radio Dealers. N.z: Agents 8 SPEDDING, LTD: AUCKLAND, WELLINGTON, CHRISTCHUROH and DUNEDIN