41774259081336_page_51

41774259081336 | page 51 | https://thedailydialectics.com/pdfs/FIOA/41774259081336/41774259081336.pdf

Page 46 SECTION B, U.K, CRYPTOGRAPHIC EQUIPMENTS PART I, LITERAL CYPHER MACHINES, 1. Machines requiring no external source of power. (a) PORTEX, A small hand operated off-line tape printing cypher machine with an electrical permuting maze designed for low echelon use, to operate the maze is derived…