The text describes the craft and practice of forming sheet metal into hollow circular shapes by spinning on a lathe, outlining when spinning is preferable to die work for small runs, experimental pieces, or complex shapes. It explains the spinning lathe and components such as the T-rest and revolving tail-center, discusses speed selection and how metal type and thickness affect it, and surveys hand tools, forms, and sectional chucks used to shape and remove shells. Materials and typical applications are noted, and practical advice on form construction and production trade-offs rounds out the procedural guidance.