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Handling and mixing acid 222 Heating of negatives exposed to the air 78 High rate discharge testers 181 High rate discharge tests 266 and 267 and 374 Home-made batteries 25 Hydrogen and compressed air lead-burning outfit 147 Hydrogen and oxygen lead-burning outfit 146 Hydrometer. What it consists of 60 Hydrometer readings. Effect of temperature on 65 Hydrometer readings. How to take 61