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Radio Record, Volume V, Issue 33, 26 February 1932, Unnumbered Page

D° not make marks on the back of ‘the panel with a lead pencil, as the pencil mark affords a high resistance conductive path on the ebonite surface, , and impairs its insulation. / WHEN looking for a cheap cabinet or for a good method of staining a box, do not forget the possibilities of .leatherette or American celoth, which, glued down carefully, is capable of giving very pleasing effects. HEN two equal resistances are connected in’ series, the total resistance is doubled. When two equal resistances are connected in parallel with each other, the total resistance is halved. D2 not drop your telephones or knock them unnecesSarily, as the permanent magnets of these for of loudspeakers) are injured by mechanical shocks, . 8 WHEN making your own coils from a description. be very careful that the direction of winding is as indicated. or otherwise you may fail to get reaction effects. , ¥ for any reason it is necessary Sto remoye the diaphragm from the telephone earpiece, it should be slid off sideways, and not pulled up from the magnets, as this is liable to bend it. ----3