I see what I've done wrong. However, it did make for a neat effect.
The camera was located on a tripod in my kitchen, aimed at the back deck which already has 4" of snow. In ten seconds, 264 pictures show about one more inch accumulation. I think I set the shutter to open every 30 seconds. Manual focus was turned off, but all other "auto" settings are at the Nikon D200 default.
Once I learn how to use the unit, I'll get better.
To the fellow who loaned me the D200, thank you.
http://vimeo.com/18161288Bob