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1945 Theatre Catalog, 4th Edition, Page 373 (349)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 373
Page 373


1945 Theatre Catalog, 4th Edition, Page 373

NATIONAL RECTIFIERS

6-TIJBII 4-TUBE



The National Heavy Duty 6-Tube Rectifier has been designed as a D.C. power supply to the Magnarc Lamp, wherever the lamp is used at high currents.

This rectifier employs six l5-ampere Tungar-type tubes, connected for full wave rectification on threephase current which results in an overlapping in impulses sufficient to produce an exceptionally smooth output current.

The high efficiencies of this rectifier, coupled with the low price and long life of the modern tube, make this rectifier a most desirable, economical means of changing A.C. to D.C.

2-TUBE



More low intensity lamps today are operated from this type of rectifier than all other means of low intensity rectification combined. The low original cost, low maintenance and high operating efficiency makes the tube-type rectifier particularly suitable in the smaller theatre where economical operation is important.

Designed to withstand higher amperages, the demands of long continuous service and overloads resulting from the use of larger carbons, this rectifier is manufactured in two capacities; the large unit is adjustable from 18 to 30 amperes and the small portable unit from 10 to 15 amperes.



Has the built-in volt-ampere characteristics necessary to maintain the perfect power balance required by high intensity proiection lamps.

The low original ecst, low maintenance and high operating efficiency makes it particularly suitable in the medium sized theatre where economical operation is important.

It is built in two models. The singlephase 28-volt 40-ampere capacity rectifier is designed expressly to supply D.C. power to the one-kilowatt high intensity arcs. The threephase 35-volt 50 ampere rectifier is used to supply D.C. power to high intensity arcs of from 45 to 50 ampere capacity.

HUNDREDS OF THEATRES are getting MORE LIGHT ON THEIR SCREENS



A UNIT OF NATIONAL STANDARD PROJECTION SYSTEM

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NATIONAL REFLECTORS

All reflectors gradually deteriorate to a state where replacement cost becomes insignificant since a drop of only 10%; in the reflective efficiency in your mirror results in a corresponding decrease in screen brilliancy, and represents a loss amounting to 10% of the cost of your current and carbons. Replace your mirrors regularly with new National reflectors. They are available for all types and makes of arc lamps.

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1945 Theatre Catalog, 4th Edition, Page 373