12 inch f/6 pyrex fused - conical shape - weight 5 lbs.All parts 3/8 inch thick pyrex. Has 5 inch diameter solid base with central hole.

Below is a picture of the first atm made 24 inch F/3.3 cellular done in "84.On the right can be seen the edge of a full size 24 inch Holomask used in null testing the mirror.

                                                                           12 inch

12 inch f/3 fused pyrex - all glass 3/8 inch thick.Inner ring of ribs are 1 1/4 inches high - no base ring.Outside ribs are wedged shaped-high inner end only 1/2 inch high.Central hole is 2 inches.

    Below are various articles on  lightweight cellular mirror design parameters 

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