Johannison block

Noun

 * 1) * 1951, Isaac Asimov, Foundation (1974 Panther Books Ltd publication), part V: “The Merchant Princes”, chapter 8, page 154, ¶¶ 4–5
 * Mallow stood them upright and shaved the ends off with a single stroke of the shear, and then joined the pipes, fresh cut to fresh cut. [¶] And there was a single pipe! The new ends, with even atomic irregularities missing, formed one piece upon joining. Johannison blocks, at a stroke.
 * Mallow stood them upright and shaved the ends off with a single stroke of the shear, and then joined the pipes, fresh cut to fresh cut. [¶] And there was a single pipe! The new ends, with even atomic irregularities missing, formed one piece upon joining. Johannison blocks, at a stroke.