Late 19th Century Cased Mathematical Drafting Instrument Set with Bone-Handled Ruling Pen

A comprehensive set of mathematical drafting instruments dating from the late 19th to early 20th century. The collection comprises various technical tools including compasses, dividers, and a ruling pen featuring a carved white handle, likely bone or celluloid. The instruments are constructed from nickel-plated brass and steel, typical of the precision engineering of the period. The set is housed in its original rectangular wooden case, fitted with brass hinges and dual hook latches. The interior is lined with a deep blue velvet, contoured to hold each specific instrument. While no maker’s mark is present, the design and construction are consistent with high-quality technical sets of the era. Case measures approximately 19.5 cm x 7.5 cm x 3 cm.