An entomologist’s folding microscope.

[Probably English, c.1840]. Folding microscope, 110 mm (handle to lens), consisting of a slotted brass supporting arm, 110 mm spiked forceps, dual lens microscope, with turned bone handle; a knurled brass knob acts as a forceps holder, and allows for positioning; the lens can be rotated to configure different magnification powers; housed in the original card case (some wear and rubbing) measuring 120 x 30 x 25 mm.

Microscopes of this type, known variously as ‘Jones’, ‘Botanical’, ‘Entomological’, or ‘Common Flower or Insect’ microscopes, rarely appear with a maker’s mark or signature.