COMPOUND UNIVERSAL MICROSCOPE-STAGE MINERAL HOLDER
MAKER: R & J Beck
MODEL: 'INTERNATIONAL' or 'LARGE BEST' or 'GRAND' MICROSCOPE or 'IMPROVED MICROSCOPE WITH SWINGING SUBSTAGE'
c. 4th QTR 19TH C.

The Stage Mineral Holder
is a device for holding a hard irregular object, like a rock or mineral. The distance between the two sets of prongs is adjustable. With the object held firmly between the two sets of prongs, the distance between the prongs can be locked with the brass knurled knob and the specimen can be rotated with either black knob. This is an uncommon accessory, compared to many others.