Special Features:

Designed to inspect cannon bores; 29 ft 9 in. Assembled lg; 3 extension tubes; bore size 42 ft 8 in. Max lg 57 mm min diameter 280 mm dia; w/rempovable head; 57 mm through 90 mm illuminating head 90 degrees prism 105 mm through 280 mm; elec oper ac 110v 60 hz 110v 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.