CHAPTER VI.

HOW TO SELECT BATTERIES FOR GAS LIGHTING.

Electrical Rules--Electromotive force--Amperes--Resistance--Selecting a battery--Arrangement of battery--Series--Multiple--How to get high voltage or large current--The Leclanche Cell--The Samson Cell--The Dry Cell and how to make one--The Edison-Lalande Cell--The Fuller Cell--Care and maintenance of batteries 78

LIST OF ILLUSTRATIONS.

FRONTISPIECE--COMPLETE WIRING PLAN FOR A HOUSE. 1 DIAGRAM OF SIMPLE CIRCUIT 2 2 DIAGRAM OF SIMPLE CIRCUIT WITH SPIRAL 2 3 DIAGRAM OF SIMPLE CIRCUIT WITH SPIRAL AND GALVANOMETER 2 4 DIAGRAM OF CIRCUIT WITH IRON CORE 4 5 DIAGRAM OF RUHMKORFF COIL 4 6 ELEVATION OF RUHMKORFF COIL 6 7 PENDANT BURNER 7 8 BURNER CIRCUIT 8 9 PLAIN BURNER 10 10 RATCHET BURNER 11 11 STIFF-PULL PENDANT 12 12 STEM BURNER 14 13 ARGAND BURNER 15 14 WELSBACH BURNER 16 15 ACETYLENE BURNER 17 16 PUSH BUTTON 19 17 BARTHOLDI BURNER 21 18 BOSTON AUTOMATIC 22 19 CONCEALED AUTOMATIC 24 20 DIAGRAM WIRING ONE “AUTOMATIC” FROM TWO PUSHES 27 21 DIAGRAM WIRING ONE “AUTOMATIC” AND TWO PENDANT BURNERS 28 22 SIMPLE SWITCH CONNECTIONS 33 23 DETAILS OF AUTOMATIC CONNECTIONS 35 24 DETAILS OF CELLAR AUTOMATIC CIRCUITS 35 25 NUT WRENCH 40 26 AUTOMATIC OPERATED BY DOOR-TRIP 44 27 PRIMARY COIL 46 28 SYRACUSE CUT-OUT 50 29 BOSTON CUT-OUT 51 30 DETAILS CUT-OUT ROD--NORMAL 52 31 DETAILS CUT-OUT ROD--OPERATING 53 32 BULB CUT-OUT 54 33 JUMP SPARK BURNER 56 34 WELSBACH BURNER FOR SERIES LIGHTING 56 35 PILLAR BURNER 56 36 CIRCUIT FOR JUMP SPARK GAS LIGHTING 57 37 INSULATOR 59 38 EDWARDS’ CONDENSER 60 39 EDWARDS’ BURNER 61 40 EDWARDS’ BURNER 61 41 DIAGRAM OF EDWARDS’ CONDENSER CIRCUIT 62 42 CIRCUIT FOR JUMP SPARK SWITCH 64 43 ELECTROMAGNETIC TRAILER 66 44 DIAGRAM OF RUHMKORFF COIL CIRCUIT 68 45 WINDINGS OF SECTIONS 73 46 SECTIONAL DIAGRAM 74 47 CONTACT BREAKER 75 48 CONTACT KEY 76 49 FALL OF POTENTIAL DIAGRAM 79 50 SERIES ARRANGEMENT 81 51 MULTIPLE ARRANGEMENT 82 52 LECLANCHE CELL 84 53 SAMSON CELL 87 54 NEW STANDARD CELL 90 55 EDISON-LALANDE CELL 92 56 FULLER CELL 94 57 GRENET CELL 95