Those who have not been around SLAS a pretty long time may not have heard that early on the very first scope planned for SPOC was to have been a 1 meter (ok, some called it a 40 *inch* but I try not to use such four letter words <g>). Or that the primary mirror was to have been made of several smaller mirrors glued to a slab of granite and ground and polished as a single piece of glass. I have not been able to find any pictures from back then. But a few hours ago the son of Jerry Montgomery (Jerry supplied the SPOC dome) emailed several scans of pictures from back then. They should eventually end up on the SLAS website but in the mean time here's a sampling, one showing Jerry standing inside the mirror cell and another showing the prototype setup for grinding the big mirror. Pictures were taken probably in 1975. http://users.wirelessbeehive.com/~paw/temp/PRESPOC.JPG patrick p.s. In case you are wondering the optics never materialized and the project was scrapped.