Method and apparatus for viewing and measuring damage in an inaccessible area

摘要: An optical viewing tube having an eyepiece at one end and a prism tip the other is provided with system therebetween which will provide focus for object being viewed. A distance indicating disk or device on said movable by focusing mechanism to indicate from of viewed object. camera be attached take picture object, properly marked reticle placed photograph taken, proper distances between spaced points as seen in photographs. The calibrated along its length so that penetration can accurately known retention adapter used rigidly fix it place. includes compass rose indicates position prism. alignment also insure housing connected. modification has numeral containing measuring device, this obtained obtaining after units divisional value specific reference unit size multiplied number get actual distance.