Special Features:

5designed to inspect cannon bores; 7 ft 6 in. Assembled lg; bore size 8 ft 8 in. Max lg 20 mm min diameter 40 mm max dia; w/removable head; 20 mm illuminating head 37 mm through 40 mm illuminating head; elec oper ac 110v 60 hz 6-8 v lamp; w/carrying 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.