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Topic: 1940's automation
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 02-05-2001 01:40 PM
I would think a simple conductive foil cue placed on the film would not have been beyond the technology of the time. Or even (heaven forbid ) NOTCHING the edge of the print to be picked up by a microswitch, which was once the way original negatives were "cued" to make printer light changes.I recall from experience that using a carbon/graphite fusible link to automate the ignition of a carbon arc was not very reliable. The power would come on, the fusible link would go "pfft", and the arc MIGHT be lit. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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John Eickhof
Jedi Master Film Handler
Posts: 588
From: Wendell, ID USA
Registered: Jan 2000
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posted 02-05-2001 09:04 PM
During the late sixties & early seventies when automation was first gaining wide use, National Carbon (Union Carbide) actually made auto starters for the arcs! They were a pencil thin piece of carbon at a length to suit the particular arc lamp and they were notched to fit against the face of the Pos & Neg sticks, when the power was energized, the starter would vaporize into a spark and light the arc! There were also companies like Best products who made spring loaded & solenoid operated starter assys for medium intensity lamps like the Brenkert Enarc, Peerless, and Strong lamps, these would pivot the negative stick into the positive, then slowly retract to normal arc gap! We had several sets of these operating when I first started in the 70s! Thanks for the additional info on the cue meters! I will get some pix of them soon!------------------ John Eickhof President, Chief Slave Northwest Theatre Equipment Co., Inc. P.O.Box 258 Wendell, ID. 83355-0258 208-536-5489 email: jeickhof@nteequip.com
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