The electro-magnet and its employment in ophthalmic surgery : with special reference to the detection and removal of fragments of steel or iron from the interior of the eye / by Simeon Snell.
- Simeon Snell
- Date:
- 1883
Licence: Public Domain Mark
Credit: The electro-magnet and its employment in ophthalmic surgery : with special reference to the detection and removal of fragments of steel or iron from the interior of the eye / by Simeon Snell. Source: Wellcome Collection.
Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.
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![metres long, one millimetre wide, and 0*3 thick. This instrument will support from the point a key weighing twenty-eight grammes (nearly one ounce). The attrac- tive force of this magnet seems hardly greater than the simple bar-magnet used unsuccessfully in Case No. 18, and is, as will be noticed further on, very little com- pared to that of an electro-magnet; for the best devised simple-bar or -other magnet is far inferior to a pro- perly constructed electro-magnet, which readily fulfils the requirements necessary for our purpose. Experience has not only confirmed the opinion formed as to the efficiency of the electro-magnet devised by the author and described in the ( British Medical Journal' in 1881, as before mentioned, but the success attained in the fiery ordeal of practice has [Half Actual Size.] demonstrated its value. Several ophthalmic surgeons have adopted it, and in other instruments its principle has been incorporated. As at present used it is some- what less in size than the original instrument, but its efficiency has been maintained. Briefly described, the electro-magnet * consists of a core of soft iron around which core is placed the coil of insulated copper-wire, * Made by Messrs. Cubley and Preston, High Street, Sheffield.](https://iiif.wellcomecollection.org/image/b21078476_0019.jp2/full/800%2C/0/default.jpg)
