A brass drum microscope, Meyer & Co, 19th century, focusing by rack and pinion in original mahogany box with six numbered objectives, and a virtually complete set of accessories, the barrel signed 'Meyer & Co., Opticians, 29 Market St, Mancester', the case 10 x 27.5 x 14.5 cm. Provenance: Purchased from Sotheby's London, Scientific Instruments, Watches and Clocks, lot 52, 22nd July 1977