A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 394
very important part of the pattemcutters acquirements §16 DEVELOPMENT OF SURFACES 11 consists in being able to recognize in various irregular objects those forms that may beonly a portion of some regularsolid. In other words, the studentmust learn to establish in his ownmind the connection between…
