A Set of Nickel-Plated Beam Compass Trammel Heads in Fitted Case

A set of technical drawing instruments comprising beam compass trammel heads and interchangeable attachments. The components are constructed from nickel-plated brass and are designed to be clamped onto a wooden or metal bar for the purpose of drawing large-diameter circles or arcs. The set includes two main trammel heads featuring knurled adjustment screws, one ruling pen attachment, and one sharp divider point. The instruments are housed in a professional fitted case with a black textured exterior and a brass-toned metal latch. The interior is lined with blue velvet in the base and blue satin in the lid. No maker marks or scales are visible on the instruments or the case. This set is characteristic of British technical drawing instrument production from the late 19th to early 20th century. The wooden beam originally used with these heads is not present.