Abstract: A scope for viewing the internal surface of a bore or similar cavity for use in combination with a light source. The scope includes a rod having an image transmitting end and an image viewing end. Diffusing and reflecting means are located at the rod viewing end and are surrounded by a housing. External light is directed onto the diffusing and reflecting means which in turn directs the light along the length of the rod to its image transmitting end and onto the cavity surface when the scope is inserted into the cavity. The image transmitting end of the rod allows the cavity surface to be viewed.

Abstract: A scope which is for viewing a selected portion of the internal surface of a bore or similar cavity and which includes a viewer of optically clear light transmitting material and a housing. The viewer is encased within a longitudinal bore of the housing with its viewing end adjacent the upper end face of the housing and its image transmitting end aligned with a transverse bore of the housing so that the image of a selected portion of the cavity surface is exposed to the image transmitting end, thereby permitting visual observation of a selected portion of the internal surface of a cavity when the housing is placed within the cavity.

Abstract: A scope for viewing the internal surfaces of bores or similar cavities which includes a rod of optically clear material having an image transmitting end, a light gathering end, and a viewing surface intermediate to these ends. An optical surface is formed internally of the rod at an angle to the axis of the rod and serves to reflect the image of the cavity surface out of the rod for viewing.

Abstract: A viewing rod in which a visual change in color at the transmitting end of the rod indicates that the level of the liquid within a receptacle has reached the transmitting end.

Abstract: A scope which is for viewing the internal surface of a bore or similar cavity and which includes a rod having a viewing end and an image transmitting end. The rod is formed of optically clear light transmitting material through which the internal surface of a bore or similar cavity at the image transmitting end of the rod is viewed from the viewing end of the rod. The transmitting end of the rod includes an optical surface paralleling the axis of the rod. A pair of circular gauging indicators are formed on the optical surface and are spaced a selected distance apart along the axial direction of the rod to permit a selected part of the internal surface of the bore to be viewed between the indicators for measuring purposes.