Questions and Answers

Radio Record, Volume IV, Issue 20, 28 November 1930, Page 10

Questions and Answers

| W A. (Nelson): Is the solution of * Hpsom salts as good as the sulphuric acid in the Daniels cell? A: See reply to "Fivalve.’’ 2. Is the gravity type of cell as good as the other? _ A.: It is not generally as satisfactory, for it is only a compromise. We have not, however, tried one against the other and would be very interested to hear from correspondents on this point. . 3. My set draws just over a third of an amp. Would four cells be sufficient used directly from the charger?-Yes. 4. I have an 100 amp. hour battery. Will six cells keep it charged? A.: It depends on the drain. If you are using a third of an amp., yes. 5. If used as a battery direct, what is the method of testing for charge?-A voltmeter, H. (Nelson): I have had the Daniels charger working three weeks, and find that some of the commercial zinc rods are eaten away. A.: As you are using a saturated solution of Epsom salts you will find if you water it down to half, it will stop your zines being eaten away. 2. In a former letter I asked you if rain water was necessary, but you must have overlooked my question. , A.: Sorry, your question was certainly overlooked. Pure rain water should be used, and this collected in an earthen vessel, placed out in the rain. Do not use tank water. 3. Must the bluestone be powdered? A.: No, just drop the erystals in the jar and pour the water on them. 4, Is the Epsom salts solution easier on the zines than the sulphurie acid, and is mercury necessary with the former? A.: The Bpsom salts is generally better as far as zine consumption is concerned, and no matter what the electrolyte used the zines are better amalgamed. ] EXNCLOSE a sketch of the Daniel cell charger. Is it correct? Answer: No. If you read the article again you will see that the sulphuric acid is placed inside the porous pot and the water added. The blue stone is placed in lumps outside the pots and the water poured on it. The zine rod is the negative electrode, and placed inside the pot with the sulphuric acid solution. The copper strip is positive and is outside the porous pot in the bluestone solution.