Peg securing method and apparatus

摘要

Hollow tubular pegs having bases and stems, and pegs without bases having only stems, with distensible portions on their stems which are caused to bulge to assist in anchoring the pegs into a medium in which they are inserted and method and means for forming the bulges by distending portions of the stems after insertion into a medium; and means to anchor pegs carrying data instruments into a position within a medium by causing distensible portions of pegs to bulge within the medium.