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MAINTENANCE AND INSPECTION 169
Under no circumstances should anyone open a 4-A reproducer unit or loosen any screws other than those mentioned, for it is filled with a special damping compound. The reproducer will be spoiled if this leaks out. Never attempt to repair or adjust reproducers. Before using a new reproducer during a show test it by playing a record with it or by listening across its terminals with the headset.
VI. PHOTO-ELECTRIC CELLS
To insure correct position and connections for the photoelectric cell be sure that the window in the cell lining is properly adjusted to the opening in the partition separating the cell compartment and the film compartment.
VII. STORAGE BATTERIES
A. Storage Batteries, Attaching Leads to Terminals On most storage batteries made for sound installation binding posts are provided to facilitate the attaching of the wires. Since the terminals are of lead, a very soft metal, markings are very easily effaced. Frequently, after a battery has been in use for some time, it is difficult to determine the positive terminals from the negative. Most batteries, moreover, have polarity indications. At times a lead becomes loose and fails to make proper contact with the terminal, or both are so corroded that their markings cannot be seen. It is therefore necessary to use some independent method of determining the polarity. If traces of corrosion are indicated on the terminals, the one having a green-coloured corrosion is positive, and the one having a white or gray corrosion is negative. Another method is to apply a suitable voltmeter to the terminals. The leads from the voltmeter are usually marked positive or negative; or else one lead may be red and thus indicate positive polarity. If the needle of the voltmeter deflects toward the