The Bristol Jupiter aero-engine. A manual for the care and maintenance of the Series VI engine, i

The Bristol Jupiter aero-engine. A manual for the care and maintenance of the Series VI engine, issue No.10, Bristol circa 1925, 103 pages, with diagrams, folding charts, and illustrations from photographs, and with 22 page amendment supplement, original green cloth gilt boards; together with The Bristol Jupiter Radial Aero Engine, Series VI manual, Bristol circa 1927, related to power curves, a technical description and this engine in service, 32 pages, diagrams, illustrations from photographs, original decorative card covers, (2).