A simple and inexpensive method of localising with x-rays / by Wm. Jas. Fleming, M.D.
- Fleming, William James.
- Date:
- 1898-1899
Licence: Public Domain Mark
Credit: A simple and inexpensive method of localising with x-rays / by Wm. Jas. Fleming, M.D. Source: Wellcome Collection.
Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.
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![[FROM THE PROCEEDINGS OF TIIE PHILOSOPHICAL SOCIETY OF GLASGOW.) A Simple and Inexpensive Method of Localising with X-rays. By Wm. Jas. Fleming, M.D. [Read before the Society, 2nd November, 1S98.] A number of workers have devised methods of localising buried objects which cast shadows with X-rays. Probably the best is Dr. Mackenzie Davidson’s, and with it most accurate results can be obtained; but, like all the others which I have seen described, it is elaborate, cumbrous, and expensive. All the methods are based on the measurement of the distance apart at which two images are produced by rays impinging upon the object in two directions at known angles to each other. In trying to arrive at this by simply moving the focus tube in the ordinary holder to definite distances on each side of the perpendicular passing through the object, I found the great difficulty lav in the fact that the tube had to be rotated upon both its axes, in order to make the slanting surface of the anode face in the desired direction. When the tube is held in the usual manner, in a clamp, this requires so much measurement and adjustment that a large element of uncertainty is introduced. The small holder which I am about to describe overcomes this difficulty by enabling the tube to be rotated on two axes crossing at the centre of the anode, the point from which the rays proceed, and in this wav avoiding any alteration of the distance of this point from the plane of the surface of the sensitive plate. As may be seen from the diagram, Fig. 1, the holder consists of one vertical and two horizontal arms, the horizontal arms coming off at right angles, at the ends and opposite sides of the vertical. The upper horizontal arm is perforated near its extremity from above down by a hole large enough to take the neck of the tube, and is provided with a pinch screw](https://iiif.wellcomecollection.org/image/b24918982_0005.jp2/full/800%2C/0/default.jpg)
