Special Features:

Stainless steel outer tube, two cell dhromebattery handle type d dcell, dim., 0.140 in. Od., 48.000 in. Lg, right angle vision, 75 degrees axis, field of vision approx 55 pct, magnification, approx 8x at objective lens to approx 1x at 6.000 in. From objective lens, universal focus, resolution sixteen minutes of arc at center, accessories, no. 23 battery handle, 8.000 ft connecting cord w/rotating contact, two spare lamps, lamp wax, rubber tip, and a fitted case

Properties:

A viewing device used to visually inspect items such as cannon bores, internal combustion engine cylinder walls, propellant perforations of rocket motors or similar items, for defects of manufacture, corrosion, scars, erosion, etc., without the necessity of disassembling the item(s). It may or may not have extension tubes to cover the various ranges of inspection. The item is basically a straight-tube telescope using a mirror or prism.