visibility Similar

code Related

Motion picture electricity (1914) (14803878623)

description

Summary

Identifier: motionpictureele00hall (find matches)

Title: Motion picture electricity

Year: 1914 (1910s)

Authors: Hallberg, Josef Henrik, 1874-

Subjects: Motion picture theaters Electric lighting

Publisher: New York city, The Moving picture world

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer

About This Book: Catalog Entry

View All Images: All Images From Book

Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:

used. Fig. 3 gives a diagrammatical illustration of an elec-tric generator and a 2-wire distribution system in its sim-plest form operating a motor, incandescent lamps andarc lamps. The illustration indicates the names of theprincipal parts of the system and how connections aremade. We have already learned that the further the currenthas to be transmitted, the greater the drop of voltage inthe wires, therefore it takes larger wires to carry a givenquantity of amperes a long distance, and this is also oneof the reasons why the field rheostat for the generator isnecessary at the power house in order to raise the voltageof the generator to overcome the line losses, and it is oneof the duties of the dynamo attendant to keep the voltageat the proper amount at all times by means of the fieldrheostat. The battery is only suitable for small and inter-mittent work. 26 MOTION PICTURE ELECTRICITY DIRECT CURRENT 2 WIRE ELECTRIC SYSTEM RHEOSTAT SHUNTFIELD WINDING \ ^ARMATURE —COMMUTATOR BRUSHES

Text Appearing After Image:

Fig-3 MOTION PICTURE ELECTRICITY 27 Where large current supply is required, it be-comes necessary to make the electricity by a dyna-mo electric machine driven by an engine or similarpower. THREE-WIRE SYSTEM FOR DIRECTCURRENT The 2-wire direct current distributing system is used,as a general rule, in small plants and in isolated plantswhere the distance from the electric generator to thepoint where the current is used is not very great. In abuilding, for instance, the distance would never be overa few hundred feet, and in a small town the distance fromthe power .station to the furthest consumer might not beover one mile. In such places the 2-wire system may beinstalled and used, although the cost for copper wire isgreat as compared with the 3-wire system, which is gen-erally used where a large amount of power is requiredand where the distance may be several miles, as is thecase in the larger towns and cities. The 2-wire system may be either no or 220 volts, butonly one of these voltage

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

label_outline

Tags

electric lighting motion picture electricity 1914 book illustrations high resolution
date_range

Date

1914
create

Source

Library of Congress
link

Link

http://commons.wikimedia.org/
copyright

Copyright info

public domain

label_outline Explore Motion Picture Electricity 1914, Electric Lighting

Topics

electric lighting motion picture electricity 1914 book illustrations high resolution