esta impregnated mats 15
Mechanical rectifier 131
Melting pot for lead 220
Mercury-Arc rectifier 129
Milky electrolyte 206
Motor-generators 106 to 112
Motor-generators. Care of 110
Motor-generators. Operating charging circuits of 109
Motor-generators. Sizes for small and large shops 106
Motor-generators. Suggestions on 108
Moulding instructions 220
Moulding materials 220
Moulds. 164 to 170
Moulds for building up posts 165
Moulds for burning lead sticks 164
Moulds for cell connectors 168
Moulds for plate straps 167 and 169
Moulds for terminal screws 168

N

Negative plates. Changes at, during charge 39
Negative plates. Changes at, during discharge 37
Negatives. Bulged 79
Negatives. Granulated 78
Negatives. Heating of, when exposed to the air 78
Negatives with roughened surface 79
Negatives with softened active material 79
Negatives with hard active material 79
Negatives. Washing and pressing 351
New batteries. Putting, into service 224
Non-sulphating Eveready batteries 402

O

Open-circuits 86
Open-circuits. Caused by acid on soldered joints 86
Open-circuits. Caused by broken terminals 86
Open-circuits. Caused by poor lead burning 86
Opening batteries. Equipment needed in 97
Opening batteries. Heating sealing compound 332
Opening batteries. Instructions for 328
Opening batteries. Pulling elements out of jars 333
Opening batteries. Removing connectors and terminals 329
Opening batteries. Removing post-seal 331
Opening batteries. Scraping compound from covers 334
Opening batteries. When necessary 326
Opening batteries. When unnecessary 325
Operating conditions. Effect of, on capacity 44
Overdischarge causes sulphation 69
Oxides used for plate pastes 11
Oxygen and acetylene lead burning outfit 143
Oxygen and hydrogen lead burning outfit 146
Oxygen and illuminating gas lead burning outfit 146

P

Packing batteries for shipping 271
Painting case after bench charge 203
Paraffine dip pot 182
Paste formulas 11
Pastes. Applying to grids 11
Patent electrolytes 59
Philadelphia radio batteries 260
Philadelphia starting batteries. Age codes for 243
Philadelphia starting batteries. Old type post seal for 398
Philadelphia starting batteries. Putting new, into service 228
Philadelphia starting batteries. Rubber cases for 401
Philadelphia starting batteries. Rubber-Lockt seal 399
Philadelphia starting batteries. Separators for 402
Plante plates 27
Plante's work on the storage battery 27
Plate burning-ra