Reduced height electrical insulating bushing with sight glass

Claim 1

A REDUCED HEIGHT OIL-FILLED ELECTRICAL BUSHING HAVING A COMPOSITE INSULATING SHELL FOR AN AXIALLY EXTENDING CENTRAL CONDUCTOR, SAID SHELL EXTENDING BETWEEN AN END ADJACENT A CONDUCTING MOUNTING FLANGE AND AN END ADJACENT A CONDUCTING LINE TERMINAL, SAID SHELL HAVING THREE AXIALLY ALIGNED CIRCULAR CROSS SECTION PORTIONS WHICH PROGRESSIVELY INCREASE IN AXIAL LENGTH FROM THE SHORTEST WHICH IS ADJACENT THE LINE TERMINAL END TO THE LONGEST WHICH IS ADJACENT THE MOUNTING FLANGE END, SAID SHORTEST AND LONGEST END PORTIONS CONSISTING OF OPAQUE INSULATING MATERIAL, THE INTERMEDIATE PORTION OF INTERMEDIATE LENGTH CONSISTING OF TRANSPARENT MATERIAL HAVING A SMOOTH OUTER SURFACE FOR FACILITATING VISUAL INSPECTION OF OIL LEVEL, THE LONGEST PORTION HAVING A PLURALITY OF AXIALLY SPACED INTEGRAL FLANGES EXTENDING RADIALLY OUTWARDLY THEREFROM, THE SHORTEST PORTION HAVING AT LEAST ONE INTEGRAL FLANGE EXTENDING RADIALLY OUTWARDLY THEREFROM, SAID FLANGES EACH HAVING A REVERSE CONTOUR DRIP-CAUSING EDGE ON THE UNDERSIDE THEREOF, SAID COMPOSITE INSULATING SHELL HAVING WET AND DRY OUTSIDE SURFACE INSULATING STRENGTH WHICH IS SUBSTANTIALLY EQUAL TO THE CORRESPONDING INSULATION STRENGTH OF A CONVENTIONAL SHELL OF THE SAME DIMENSIONS AND CONFIGURATION BUT CONSISTING ENTIRELY OF SAID OPAQUE INSULATING MATERIAL.