Drive-Ins.com
> > > >

1948-49 Theatre Catalog, 7th Edition, Page 410 (397)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 410
Page 410


1948-49 Theatre Catalog, 7th Edition, Page 410

Probably the most unique item of these modifications is the water-cooled positive contact assembly (Fig. 10).

The facing halves of the contacts are made of pure silver castings, the rear halves are of brass castings. Each pair of mated castings is cupped out in the center section so that when they are assembled together a hollow compartment results for the circulation of water. The inlet for the water into each contact compartment is through a copper tube 'leading upward to the top of the compartment, the outlet is by another tube at the bottom of the compartment, the cubical content of each contact compartment is 51/2 inches.

Extremely satisfactory operations were obtained when up to 290 amperes were used at the arc and with only a 1//-rinch positive carbon protrusion from the front face of the contacts and without the usual heat bafile plates being used between the arcing end of the carbon and the contacts.

Temperature tabulations were as follows:

0.138 cubic foot per minute (approximately 1 gallon) Room temperature during test . . . . . . . .. '720 F.

Total water Flow . . . .

Outlet water temperature before test 690 F. Outlet water temperature after 10 minutes of operation . . . . . . . . . . . . . . . . . . . . . . . . .. 88D F.

FIG. 9-Heat filter and blower.

1948-49 THEATRE CATALOG



FIG. Ill-Special water-cooled positive carbon contacts.

Outlet water temperature after 20 minutes

of operation . . . . . . . . . . . . . . . . . i . . . . . . .. 533iI F. Maximum temperature rise of water above

room temperature . . . . . . . . . . . . . . . . . . .. 21D F. Maximum temperature rise of water after

20 minutes of operation . . . . . . . . .. 240 F.

Because this water-cooled contact unit is adaptable to the standard HyCandescent projection arc lamp and its

operation at 290 amperes was so highly satisfactory we expect to make it available to theatres now using our standard 120- to 170-ampere lamp, who are will ing to provide the necessary water-piping requirements for it in their projection rooms.

new;t
1948-49 Theatre Catalog, 7th Edition, Page 410