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312 RICHARDSON'S BLUEBOOK OF PROJECTION
about ten dollars worth of unnecessary damage to machinery is exceedingly false economy.
It is best to ask the manufacturer to recommend a lubricant and to follow his recommendation even though he may name an oil he himself supplies. His reputation requires that his machine perform well, and he is extremely unlikely to suggest anything but what is proper.
Ball Bearing Lubrication
(118) Be exceptionally careful about the lubricant for ball bearings. It must be wholly free from acid because acid will roughen quickly the polished surface of the balls and their races. Grease that contains animal fat is acidic and should not be used. Here, too, the manufacturer's advice should be followed implicitly.
Installation Suggestions
(119) Immediately upon receipt of a new motor-generator set examine its name plate, making sure that the voltage, phase and frequency of the motor and amperage capacity of the generator are what are required for your particular purposes.
Sometimes, after all the work of installation has been completed one of those factors has been found to be wrong, whereupon the whole set had to be removed and another installed. (120) Small two or three-phase motors, say up to and including 5 H.P. capacity, usually may be connected with the line merely by closing a switch. For larger motors a "compensator" or variable resistance starter is required.
(121) All wires must be large enough to carry the current without developing unnecessary resistance (voltage drop), which of course means waste. (122) It is a mistake to consider the installation satisfactory if the wires merely carry the maximum current permitted by the Underwriters. Underwriters' wire capacity restrictions indicate safety for wires and insulation but offer no guarantee of real economy in operation. As a matter of fact, any wire working at maximum Underwriters' capacity will offer enough resistance to show considerable