Richardson's handbook of projection (1930)

1092 HANDBOOK OF PROJECTION FOR makes for frequency and regularity of examination and care. If the batteries are located in a dark, inconvenient place, they almost certainly will not have as excellent care as they would receive were the location convenient and well lighted. That last is just plain common sense. Never locate batteries and motor generators in the same room. The gases will corrode the wires if you do. SPECIAL LIGHT SOURCE.— Even though the battery be located in a well lighted place, a light source will be needed to examine the water level in the cells. This may properly be (a) an incandescent lamp attached to a cord of sufficient length to permit of its use at each of the cells. This lamp should have a glass or porcelain opaque or semi-opaque shade to direct the light downward— glass or porcelain because a metallic shade w^ould set up danger of short circuiting the cells by coming into contact with the connecting bars. It will be well to wind the lamp socket itself with insulating tape, or to use a porcelain socket, (b) A concentrated beam flashlight, with all its metal parts wound with insulating tape, so that if it be inadvertently laid down on top of a battery no harm will be done. This lamp should be attached, by means of a light chain run through a light rubber hose for insulating purposes, to some nearby stationary object. This is so that when the lamp is wanted it will be there. An incandescent lamp, as above described, is best, however, because a flashlight battery may be found to be dead just when the lamp is most needed, with consequent postponement of needed inspection or battery care. CLEANLINESS. — It is said that cleanliness is next to Godliness. I don't know about that, but certainly clean