We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
MANAGERS AND PROJECTIONISTS 541
THE SYNCROVERTER
The "Syncroverter" is a device concerning which we have little personal knowledge, but the fact that the Simplex Division of the International Projector Corporation has conducted exhaustive practical tests and has pronounced it O. K., has seemed to warrant a somewhat extended description of it in the Bluebook. This course is further justified by reason of the fact that the device presents several points of very decided advantage, in that it is free from appreciable vibration, light in weight, very compact and hghly efficent in operation.
CAUTION. — We would, however, caution you that in cases where line voltage is subjected to abnormal fluctuations, you should lay the facts before the manufacturer of the device, or his accredited agent, and secure from him an absolute guarantee that the Syncroverter will work satisfactorily under that condition. This does not, however, include the ordinary range of voltage fluctuation, which the machine is expected to take care of perfectly.
The Syncroverter is made by the Liberty Electric Corporation, Stamford, Connecticut, and is marketed by the National Theatre Supply Co., who have offices in all principal cities and from whom any additional data desired may be had.
In its present perfected type it consists of an 8-segment commutator, rotated by the horizontal shaft upon which it is mounted, by means of a motor having only the fraction of a horsepower. This latter is the only power expended in converting the current from A. C. to D. C.
The motor consists of a polarized rotor having no windings of any sort, which revolves within a distributed stator winding, the latter divided into two sections, one being the winding in use when the machine is in normal operation ; the other a winding used only to start the motor.
The motor is brought up to speed just the same as is any induction motor. At the instant the rotor reaches a speed which synchronizes with the alternations of the power supply, its field is automatically excited by the rectifying commutator, whereupon the motor no longer operates as an induction motor, but as a single phase synchronous motor which is absolutely non-hunting, and has absolutely no phase displacement (These are manufacturer's claims) under any voltage or frequency within limits greatly in excess of the usual line frequency and voltage fluctuations.