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n6 SOUND MOTION PICTURES
battery becomes discharged and loses its energy when the specific gravity falls below normal. To measure the gravity reading the hydrometer should be used. Never allow the gravity reading to fall below 1,190. Batteries should always have a gravity reading between 1,250 and 1,285 when fully charged.
To prepare for operation when using the i-FD battery panel proceed as follows: Have the number i-set at the operation switch for F-battery set which is to be used; the number 2-set at the charge switch for F-battery switch which is to be charged; and the number 3-set at the operation switch controlling the H batteries. When you are finished operating open all the above switches with the following exceptions: (1) if additional charging is needed for the F-battery set that has been on charge keep the switch controlling this set at charge until the gravity reading reaches full charge value; (2) if the H batteries need charging set the switch controlling them at charge and keep it there until the gravity reaches full charge value.
In operating the 40-type battery panel, to prepare for operation of equipment proceed as follows : (1) set in operation the switch for the battery set which is to be used ; (2) set at charge the switch for the battery set which is to be charged. When you are finished operating open all the switches, unless an additional charging is needed for the set that has been on charge. In this case keep the switch controlling the set at charge until the gravity reading reaches the full charge value.
IV. Fader
To change from one projector to another without any interruption of music or sound, when using Western Electric sound equipment, it is necessary to use a potenti