Acme-Gridley Early Models Manual
Acme-Gridley Multiple-spindle Chucking Automatics: Design, Construction, Tooling and Operation - Very detailed and comprehensive American publication for all the 4, 6 and 8 spindle Models of the R, RA, RAS, RB, BRA Types in 4, 6 and 8-spindle versions. As a complete guide to these lathes (and as-built, for example, as the BSA RAB Type) this is the most complete publication.