Abstract: A process for producing flat or parabolic mirrors for visible wavelength applications is described and includes the steps of casting onto a substrate of substantially the selected mirror shape a liquid polymer resin in multiple cured layers whereby the last applied layer has the selected mirror shape unaffected by topography flaws in the surface of the substrate. A reflective coating may then be applied to the last applied and cured resin layer.

Abstract: A durable, lightweight carbon composite forearm crutch is described that in its essential components includes three graphite/epoxy composite tubes consisting of a main support tube, a handle tube and a cuff support tube, all adhesively bonded to a single central substantially T-shaped metallic, preferably aluminum, fitting configured to dispose the handle and cuff support tubes at a comfortable angle for the user greater than 90° and preferably about 101° to 103°, a cuff attached to the upper end of the cuff support tube for receiving the arm of a user, and a slip resistant foot member at the distal end of the main support tube.