Abstract: A unique lift container for use in erecting scaffolding within power boilers and similar large enclosures having small access manholes, preferably being made from modularized forming equipment so as to be readily disassembled into constituent parts dimensioned to fit through the small access openings of such boilers.

Abstract: A solar panel for use in hostile environments. The panel includes top and bottom molded glass plates, each having a downwardly directed sidewall extending around their outer peripheries. The bottom plate is positioned beneath and within the sidewalls of the top plate thereby downwardly directing the opening to the compartment formed between the top and bottom plates. Recesses are molded in either the bottom of the top plate or in the top of the bottom plate for receiving solar cells whereby the thickness of the compartment is minimized. The recesses are sized and shaped to conform to the size and shape of the solar cells. A passageway is provided from each recess to an adjacent recess for electrical connections between adjacent solar cells which are positioned in each of the recesses. Potting compound having an index of refraction similar to the index of refraction of glass fills the compartment. The thickness of the compartment is sufficient to allow the compound to withstand thermal cycling.

Abstract: Apparatus for shifting a lens carriage including a variable magnification pancratic lens assembly having a plurality of relatively movable optical elements. The lens carriage is mounted to move a first lens element to a plurality of discrete positions along a travel path (oblique to the optical axis established at the 1:1 magnification ratio) for maintaining registration of the light image projected by the lens assembly in the image plane when the image-to-object distance is fixed. A second element of the lens assembly is carried by the first element and is longitudinally movable to a plurality of discrete positions relative to the first element. An arm is positioned in the path of movement of the second lens element to engage the second element to effect particular longitudinal movement thereof relative to the first lens element as the carriage is moved.