Page 16 Advertisement 2

Radio Record, Volume IV, Issue 47, 5 June 1931, Page 16

thick) spaced at equidistant intervals around the secondary and held in posi- tion with rubber bands until the wind- ing is completed ; the ends of the wind; ings may be soldered to tags held by bolts passed up from the undlerside of oze or two of the spacing strips; the heads of the screws being beavily countersunk SO as not to come in con- tact with the secondary. Alternatively, the primary may be wound on a former of a smaller dia- meter than the secondary former; care being taken that there is a clear air space on a sides between the prim} ary winding and the interior of _ thy secondary former_ Where a slot- wound: primary is used the primary should not quite fl1 the slot: The turns of the primary should be spaced (except where slot-wound) in order to reduce self-capacity, and since primary resistance is immaterial, ghould be wound with the finest gauge of wire which the constructor is willing to manipulate: No: 42 is not too small, and No. 36 should be regarded aS the maximum permissible; except where extreme mechanical strength is neces- SatT _ EQR THESE LONG WINTER EVENINGS T 8 Lste T NOMINAL coST Latest M[EETROet S,6. MODELS AT LOW PRiCES BAGLE Bater ROYDS-HOWARD CO, 553 COLOMBO ST,, CHCH:, A 0 J: PARK & SON Patent Attorneys Routh's Buildings, Featherston Street, WELLINGTON GUARANTEED VALVES VALVES: Very Special Prices; Condor dc. 4-volt 1 amp. UX base, 6/6 each, post free. Also BOND A.C. 281. Were 45/ Now 38/6 280_ Now 16/6 226_ Were 13/-_ Now 10/ 227 . Were 18/-. Now 44/6 245, Were 17 /6. Now 13/6 224. Were 27/-_ Now 19/6 AIl Velves pr0 Guaranteed, and will be exchanged freo ff found faulty within 0f0 Inonth. BOB HORROBIN Flashlight Corner; 2 Courtenay Place, WELLINGTON.