Richardson's handbook of projection (1927)

HANDBOOK OF PROJECTION FOR Motor Generators May a motor generator be heavily overloaded for a short space of time ? 494 What is a "motor generator? Of what does it consist ? 494 What advantage has the series type motor generator over the multiple type when using the ordinary arc? 494 Has the motor generator with a 70 volt generator advantages ? 495 Inefficiency Not Necessarily Fault of Machine Is inefficiency in a motor generator necessarily the fault of the machine itself ? 495 Where and how should a motor generator be installed? 495 to 499 Why is a basement location objectionable? 495 Is there any real objection to locating motor generator in or immediately adjacent to the projection room ? 496 Should the frame of motor generator be grounded? 497 What is especially important if the sub-base be dispensed with ? 497 What should be placed under every motor generator set having a sub-base ? 498 Why is it necessary that a motor generator of the horizontal type set perfectly level endwise? 498 No Sub-Base, Bolt Solidly Down Must motor generators having no sub-base but coupled armature shafts be bolted solid to a rigid, perfectly level foundation ? 498 Should electrical connections be made by projectionist ? 498 What should be done before starting a new set?... 499 How should oil for motor generator be selected?... 499 What is important in selecting grease for ball bearing M. G. sets ? 500 How are most horizontal machine bearings oiled? What precautions must be taken with such devices? 500, 501 Cleanliness Is cleanliness around a motor generator set essential? 501 Do loose connections cause much trouble? 501 Should there be ammeter and voltmeter and how should they be located ? 501 Commutation How should commutation be cared for? 502 to 511 What attention should be given brushes and machine before starting same ? 511 iv