Brass Ophthalmometer, ca. 1920's

Original ophthalmological instrument made in London (England) in the 1920-30s. It is an ophthalmometer or keratometer, a diagnostic instrument for measuring the curvature of the anterior surface of the cornea. It works by projecting a light to a convex mirror, where it reflects in a particular way. Thanks to the reflection the ophthalmologist, who is looking straight into the patients eye, can figure out the different curvature points of his or her cornea. This particular instrument is an attractive and interesting vintage machine, with long years of use and that has survived to our days in quite good condition.All the parts and components are original and there is no one missing. The keratometer is made of brass except for some silvery or lacquered metal pieces, and the support for the patients chin, which is made of brown bakelite. The metal shows some signs of wear but is well preserved; these signs are part of the instruments life and provide it with an attractive touch of charm. The electric wiring is in good condition though only one light works. The lenses have not been checked and the rest of the pieces move fluidly and softly.The ophthalmometer was made by Hamblin, a London firm, and we can figure this out from the copper plate screwed to the instrument´s base where we can see the inscription HAMBLIN LONDON and the serial number 620/417 printed in the metal. The word Hamblin is also engraved in both lenses (with 5 magnifications each) together with the number 635/439, and in the eyepiece. This word probably refers to Coton and Hamblin Optometrists, a firm that is currently operating in several parts of Londons. Coton and Hamblin was founded in 1903.This wonderful ophthalmometer will surely be the focus of any collection of curious machines or scientific instruments from the early 20th century. It can also be a great gift for an ophthalmologist who also loves antiques.Measurements: Width: 420 mm. Height: 500 mm (approx.).