Licence: Public Domain Mark
Credit: Improvements in light-bath apparatus / [Robert Otto]. Source: Wellcome Collection.
![JN° 9596 A.D.I960 Date of Application, 24th May, 1900 Complete Specification Left, 24th Jan., 1901—Accepted, 9th Mar., 1901 PROVISIONAL SPECIFICATION. Improvements in Light-bath Apparatus. We, Robert Otto and Karl Otto, Merchants, of 124 Kopenickerstrasse, Berlin, in the Empire of Germany, do hereby declare the nature of this inven¬ tion to be as follows: — The casings for the light-bath apparatus hitherto in use are made entirely of 5 wood. The disadvantage of these is that, in the course of time the wood warps and cracks. JNor can this disadvantage be obviated by the use of a superior and more expensive kind of wood, as the fluctuations of temperature resulting from the illumination, during the use of the apparatus are very great. According to this invention, therefore, the walls or sides of the apparatus are 10 made of glass. The remaining parts of the casing, that is the bottom, the cover, and the frames which hold the glass sides, may be made of any preferred material, wood, cast iron, or the like. The frames may for example be cast in metal and be furnished with grooves for the introduction of the sides, as also with joining and fixing laps. The last mentioned are perforated in order that 15 they may be joined by means of screws to one another as well as with the bottom and the cover of the bathing apparatus. To the frames the electric incandescent lamp is fixed direct. A light-bath apparatus with glass sides has the following advantages. The glass sides are not affected by the great heat generated in the light bath, in 20 other words by the change of temperature when the subsequent cooling occurs, whereby the wooden sides hitherto employed are caused to warp and crack, a drawback that is avoided with glass sides. Glass sides can be kept quite clean and antiseptically purified, as damp and infectious matter can never penetrate glass and settle therein. This is an important advantage as compared with 25 the porous wooden sides. Glass sides with a suitable coating at once form the indispensably necessary mirrors or reflectors for the light-bath, which otherwise would have to be inserted specially. Consequently the light-bath apparatus with glass sides can be produced more cheaply. Dated this 24th. day of May 1900 30 WHEATLEY & MACKENZIE 40 Chancery Lane, London, W.C. Agents. COMPLETE SPECIFICATION. Improvements in Light-bath Apparatus. We, Robert Otto und Karl Otto, Merchants, of 124 Koepenickerstrasse, 35 Berlin, in the Empire of Germany, do hereby declare the nature of this inven¬ tion and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement: — The casings for the light-bath apparatus hitherto in use are made entirely of [Price 8d.]](https://iiif.wellcomecollection.org/image/b30736079_0001.jp2/full/800%2C/0/default.jpg)
