{"product_id":"the-rayner-bench-polariscope-c-1950s-60s","title":"Rayner Bench Polariscope (c.1950s~60s)","description":"\u003cp\u003eThis Rayner Bench Polariscope represents a classic era of gemological instrumentation, characterized by its robust, “hammered” grey metal finish and functional industrial design. Engineered for stability and longevity, this desktop model was a staple in laboratories and jewelry appraisals throughout the mid-20th century. Based on its distinctive design and the historical timeline of the Rayner Company, this specific bench polariscope was manufactured between the mid-1950s and the late 1960s. Date of Manufacture: c. 1955–1968 Origin: London \/ Brighton, United Kingdom Manufacturer: Rayner Optical Company.\u003c\/p\u003e\n\u003cp\u003eThe primary function of this instrument is to determine the optical character of a gemstone. By passing plane-polarized light through a specimen and viewing it through a secondary polarizing filter (the analyzer), a gemologist can instantly distinguish between isotropic (singly refractive) materials, such as diamond or garnet, and anisotropic (doubly refractive) materials, like sapphire or quartz. The large, circular glass filters on this Rayner model offer a wide field of view, making it particularly effective for inspecting internal strain patterns in glass or identifying pleochroism in larger rough crystals.\u003c\/p\u003e\n\u003cp\u003eAs a museum artifact, this polariscope highlights the transition from portable, hand-held tools to dedicated professional bench equipment. It features an integrated light source, controlled by the original white toggle switch, which ensured consistent illumination—a critical factor for accurate diagnostic work before the ubiquity of modern LED lighting. This piece serves as a testament to Rayner’s legacy in British precision engineering, illustrating the reliable technology that helped standardize gemstone identification for generations of jewelers and students.\u003c\/p\u003e\n\u003cp\u003eNote: \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eCompany Transition: In 1961, Rayner \u0026amp; Keeler transitioned much of their gemological tool distribution to Gem-A. While they continued to manufacture the instruments at their Sussex factory, the aesthetic shifted in the early 1970s toward lighter, die-cast materials and different color schemes (often greenish or beige), marking this heavy, cast-metal grey version as a product of the late 50s or 60s.\u003c\/p\u003e","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":51437786333504,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/Rayner1.gif?v=1768273701","url":"https:\/\/gems.studio\/products\/the-rayner-bench-polariscope-c-1950s-60s","provider":"Gems.studio","version":"1.0","type":"link"}