[pure-silver] Re: floor vibration?


On Sep 29, 2008, at 23:29, Mark Blackwell wrote:
A lot may depend on just how big of a fan Shannon is using. Opening the floor up means giving an opening for all sorts of rats, mice, snakes potential access into the darkroom floor. I'd lot rather have them finding shade between the concrete and the floor than in my darkroom if there was any other option. In the dark a small rattler would be hard to spot. Maybe worse would be mice chewing or electrical cords and the like. You would be amazed at what can fit through what size of an opening. In Texas those pest can be a real pain in the you know where.
Putting an extra switch in for the room lights and the vent would be easy now before the drywall is up might be a good idea. But those walls are secured to something that should be secured to the slab. The slab isn't going to vibrate from that. The flooring nailers aren't likely to move either. Now a wall mounted enlarger might be a problem. Im no builder and I didn't stay at a Holiday Inn Express last night, but I would expect you to be fine.
I love my basement darkroom for the concrete floor. I can crank up the music and jump around dance or anything during the exposure and my enlarger is not budging. For several years I had a darkroom on the 4th wooden floor of an old building. Looking through the grain focuser I could see it vibrate if someone walked down the hall of if a truck drove by or if I even tapped my foot.
I put a hundred pounds of weight on the back of my enlarger at the base board level (beseler 45mxt) and I put another 60 pounds of weight on the top bar on the enlarger and I put another 20 pound bag of steel shot on top of my Aristo head. Then when making exposures I held still. Even with all that I now get sharper prints on my concrete floor in the basement. Of course now I use a Rollei and that might be part of it. 
Dennis

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