A German oxidised brass portable field microscope, attributed to Spindler and Hoyer, Gottingen, circa 1925.With chrome or rhodium plated tube fitted with eyepiece and a choice of three stacked objective lenses friction sliding within a collar incorporating a flange with threaded circumference and six holes to carry the three spike supports, either stowed alongside the tube or threaded in at an angle to create a tripod, the stage attached to the collar via a vertical bracket incorporating a slide clip and pivoted mirror beneath, the whole contained within a cylindrical two-part case closing via screw threads onto the waist of the instrument, the case inscribed Junior and Made in Germany to the opposing end caps, 14cm (5.5ins) high closed. The partnership of Spindler and Hoyer of Gottingen was established in 1898 when Julius Adolf Hoyer (1874-1943) joined with August Spindler (1870-1927). The range of products of Spindler and Hoyer was unusually extensive, including many sorts of instruments. During the two world wars, it was the main supplier of binoculars to the German army. The business was subsequently became part of - Linos AG and in this guise is still trading today. The current lot is well engineered as to be expected from an early 20th century German manufacturer and the design appears in contemporary trade adverts for Spindler and Hoyer as well as and retailer’s catalogues including Baird & Tatlock, Ltd. Scientific Apparatus List No, 60 where the model is advertised as being available from John J. Griffin & Sons, Ltd.