Colchester Student, Master and Dominion Lathes Mk 1 and "Mk. 1½" (and other versions, etc). Round-headstock model but with either a "sliding-lever" on the apron that lifts into either one of two slots to engage the power feeds - or with a single, centrally-mounted round control lever. The differences between Mk.
This page displays all the content on the website associated with the '1 1/2' model. Numeric models include all prefixes, such as 'Number', 'Mark', 'Size' etc.
Manuals for Model: 1 1/2
Heenan and Froude S 1 1/2 Wire and Strip Forming Machine: Guide Booklet with 11 General Engineering Drawings showing layout and installation.
Landis Universal & Cylindrical Grinding Machines Types 1, 1 1/2, 2, 3, 4 (1920 and 1930s Model) Operator's Instruction, Maintenance and Spares Parts Book.