Page 47 Advertisement 1

Radio Record, Volume VIII, Issue 45, 17 May 1935, Page 47

Radiotron_ Designers' Handbook. Invaluable for Engineers and Experimenters; FITY-DIGHT pages 'of practica] iu- formation oh all phases 0f radio set; desigp, together with two upto- date valve characteristic charts; ar0 contained in the second edition of the "Radiotron Designers' Handbook; which is-11OW available in New Zeajand, It is 1' book which radio engineers, seivicemen aud experimenters will find iuvaluable for reference purposes; The first nine pages are devoted to wire tables; giving weight; length, re- sistance, tuins per inch, etc;, of al] gauges of copper wire; bare and cover- ec: Among: the most important sub- jects. covered in the 37 subsequent sec tions are the following Valve formu- Iae; tuning coils and resonancc circuits; table of reactances; twist drii] sizes; decibels; resistance slabs; spools and voltage dividers, _ the design of jron core inductances, audio and power trans- former design; ~resistance cipacity coupling, cathode resistor calculations; power amplifiers (class 4, AB, B and 0) _ rectifiers; matching loudspeakers, desigu 0f: 'output transformers: and iron-core filter chokes carrying D.C. class "B" aid class S0' R F: ampli- fiers; and' R.l . power ampliliers and oscillators: The book is: 'thorouglly practical in nature from cover to' cover, and is well worth the modest price asked for it. It is obtainable from the Britou Trading Co_ Ltd,, Po Box; 1122;' Wel- lington;_ price 1/1 posted, When separated by: long- distanceg;: is etlcient contact and exchange of ideas between persons_ possible? Most certaiuly it is__BY: CORRESPON- DENCE: We haye proved this--to: the com: plete gatisfaction of ourselves and: humerous studeiits: JOHNSON'S; RADIO COLLEGE, 8-10 BEANDON' ST_ WELLINGTON: