Specification of Charles Rahn : reflectors for surgical purposes.

  • Rahn, Charles.
Date:
1865
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Charles Rahn : reflectors for surgical purposes. Source: Wellcome Collection.

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    Hahn's Improved Reflector for Surgical Purposes. surgical, and other operations. The effect of this instrument is to direct an intense light upon a given spot, and to limit the area of illumination to that spot. My improved instrument is constructed as hereafter explained and shown 5 in the accompanying Drawing, which is a perspective view. I employ a com¬ bination of lenses, comprising a condensing lens and two double convex lenses, the foci of which are arranged to accord with the distance required by the operator from the patient. I fit this combination of lenses into a cone a with draw tubes b, having a 10 rack-and-pinion adjustment c carried by a plate d made to slide in dovetails. This plate is furnished with racks e, e, pinions and milled head nuts/,/, for adjustment to enable the plate d carrying the cone and draw tubes to be raised and lowered at pleasure upon a plate g made to form a screen, and jointed to a foot or stand h. This plate is capable of adjustment by a tangent 15 screw and milled head nut i, to obtain any angle of elevation or depression that may be desired. The light may be either disconnected or it may be fixed to the instrument with any well-known means of adjustment. In the Drawing I have shewn a gas burner connected to a vertical bar j by 20 an adjustable collar and nut Jc, up and down which the light may be moved as required ; the lower part of the bar j is formed with a collar and screw nut, working on a horizontal bar l, to enable the light to be secured at any desired distance from the plate d. And having now described the nature of my said Invention, and in what 25 manner the same is to be performed, I declare that I claim the improved instrument for concentrating light, applicable to dental, surgical, and other operations, constructed substantially in manner herein-before described. In witness whereof, I, the said Charles Rahn, have hereunto set my hand and seal, this First day of September, One thousand eight 30 hundred and sixty-five. CHAS. RAHN. (l.s.) LONDON: Printed by George Edward Eyre and William Spottiswoode, Printers to the Queen’s most Excellent Majesty. 1865.