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 521
GENERAL ELECTRIC COMPENSARCS.— The General
Electric Company applies the name compcnsarc to three different types of machines, viz. :
The A. C. to D. C. Motor Generator Compensarc.
The D. C. to D. C. Motor Generator Compensarc.
The A. C. to A. C. Projection Transformer Compensarc.
The General Electric Motor Generator Compensarc, both A. C. to D. C. and D. C. to D. C. are horizontal type machines, designed for the operation of two projection arcs without resistance in series therewith. The arcs may be operated either singly or in series, amperage remaining constant, no matter whether one or two arcs are burning. The voltage of the generator, however, doubles when the second arc is struck. No resistance is used in series with the arc, either when burning singly or when both are in use.
Figure 153.
The A. C. or D. C. type consists of an A. C. motor and a D. C. generator mounted upon a cast-iron sub-base, their armature shafts connected by means of a rigid coupling.
The general appearance of the A. C. to D. C. set is shows in Fig. 153, in which the smaller element is the A. C. motor. The motors are standard A. C. machines, but the generators are wound especially for projection work. These sets are built in five standard sizes, delivering 35, 50, 70, 100 and 125 amperes D. C. to the arc. The A. C. motor may be had for any standard voltage or current frequency, and for single two or three-phase current. The machines are well made and have been in use for quite a long while, giving excellent results and general satisfaction.
The appearance of the D.C. to D.C. is shown in Fig. 154. It consists of a D.C. motor and a D.C. generator, the armature shafts of which are rigidly coupled. They are intended primarily for use on high voltage D.C. current supply, the term