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Author Topic: Any US dealers still stock carbons? Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 09-04-2010 02:09 PM                     ac arcs were also used in other applications; exposing printing plates was a major one at one time, and some types of arc streetlights were also a.c.  |  IP: Logged Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 09-04-2010 06:19 PM                     The Cyclex generator was 96 cycles. Bob  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 11-13-2010 05:27 PM                     To the people who offered to sell me carbons, sorry I haven't got back to you. I've had some problems recently and have been working very long hours so I haven't had time to deal with this. Hopefully things should be getting back to normal soon. Are they still available?  |  IP: Logged Ian Parfrey Phenomenal Film Handler Posts: 1049 From: Imbil Australia 26 deg 27' 42.66" S 152 deg 42' 23.40" E Registered: Feb 2009 posted 11-13-2010 05:49 PM                     A.C carbons are a different beast to the D.C versions. The major differences that I am aware of are -: The core's mechanical structure The core composition As the AC current 'flip/flops' between the front and rear carbons, the is a much reduced crater formed at the tip of any one carbon. Effectively, there is a crater in BOTH carbons but this is much reduced in size. This means that for 1/2 of each cycle, the rear crater is facing the aperture and not a reflector. The altered construction helps to alleviate this. As the carbons are hit with 50 cycles/sec (or 60 cycles), the composition of the carbon is infused with a compound which radiates light for a longer time- a bit like a heavy tungsten filament does. This helps to reduce the flicker at the arc and the pulsing through the shutter.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 11-14-2010 12:28 AM                     the big differnece is that AC carbons are flame based DC carbons are core based in there construction to produce a focusable crater to the reflector  |  IP: Logged

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