A Fuess Petrological Microscope

German, c.1910, engraved to the rear of the foot ‘R. FUESS, STEGLITZ-BERLIN 1365’, microscope standing on a lacquered ‘Y’ shaped base, lead filled for stability, tall upright supports the body on small trunnions, plano-concave mirror in gimbal on sliding collar, focusing substage collar with substage analyser, with Nicol prism, condenser lens, and iris, nickel plated circular stage engraved around circumference with 2 vernier scales , with swing in/out condenser, centering marks and slide clips, screw fine focus with engraved scale and vernier scale, course focus acting on diagonal rackwork, body with quick change objective holder, centering nosepiece, slide in/out analyser, slide in/out Bertrand lens on focusing collar, goniometer eyepiece with engraved scale and internal Nicol prism, complete with a micrometer eyepiece, marked ‘M’ another eyepiece marked 3, a box of accessories including 3 objectives marked 0, 4 & 7 and a few associated plates, all in the original wooden case, Note: for a similar instruments see ‘The Petrographic Microscope: Evolution of a Mineralogical Research Instrument, by Dan Kile’ p.25 fig. 22 for a very similar instrument.