Electro-medical instruments and their management : and illustrated price list of electro-medical apparatus / by Schall & Son.
- Schall & Son.
- Date:
- 1911
Licence: In copyright
Credit: Electro-medical instruments and their management : and illustrated price list of electro-medical apparatus / by Schall & Son. Source: Wellcome Collection.
215/252 page 199
![“ GRAINLESS ” INTENSIFYING OR ACCELERATING SCREEN FOR X-RAY NEGATIVES. An important improvement has been made in Accelerating Screens. A new type has been invented, which enables us to obtain the finest details free from grain on the negative. The time of exposure is reduced to between one-tenth and one-twentieth that which would be necessary without the use of such a screen. As the tubes have to be switched on only about one-tenth part of the time, they will last for ten times as many exposures, and the expense for new X-ray tubes will be reduced to one-tenth of the amount which has to be spent when these screens are not being used. Moreover, it enables the owners of medium-sized coils to make successful exposures of even the most difficult parts of the body in such a short time that patients can keep their breath, and want of sharpness due to the movements during respiration is thus avoided. The illustration shows two test objects (aluminium ladders) of the same thickness, exposed simultaneously on one plate, half of which was covered with one of these screens. Without Screen. With Screen. Prices. No. 2658A. 6£ x 8| ins. .. .. . . .. £18 0 No. 2658B. 8 x 10 ins. .. .. .. .. 2 2 0 No. 2658c. 10 X 12 ins. .. .. .. .. 2 10 0 No. 2658D. 12 x 15 ins. .. .. .. .. 3 10 0 No. 2658E. 16 x 20 ins. .. .. .. .. 5 10 0 It is important that the film side of the photo plate should be in close contact with the screen ; the casettes No. 2855 of our list are convenient for this purpose. See also page 167. [Copy of an unsolicited testimonial.] Sunderland, Mar. 3rd, 1911. I am very pleased with the accelerating screen. It has solved the problem of Cranial Radiography for me. I can get a fully exposed negative of the orbit or accessory sinuses in io seconds. Faithfully yours, A. C. Norman.](https://iiif.wellcomecollection.org/image/b28063491_0215.jp2/full/800%2C/0/default.jpg)
