Practical handbook of medical electricity for students and practitioners

Front Cover
Therapeutic Publishing Company, Incorporated, 1909 - 510 pages
 

Common terms and phrases

Popular passages

Page 254 - ... purpose. This generator is almost noiseless and practically independent of weather conditions. The use of additional plates proportionately increases the amperage. There can be little question that a high speed static machine having a suitable number of plates is adequate to every skiagraphic demand. Elaborate arrangements are not needed for successful work in dental skiagraphy. The patient may be seated in an ordinary chair, and as the period of exposure is not extended, it is not necessary...
Page 132 - ... cells of the anterior horns of the gray matter of the spinal cord), the outward expressions of our personality.
Page 251 - ... examination upon a small screen whose surface is coated with a layer of platino- barium cyanide. This material has the property of fluorescing under the influence of the X-Ray, and thus revealing by variations in density the character of the tissues through which it passes. In this examination the patient and operator, together with the focus tube, are preferably in a darkened room, or a dark cloth may be used to exclude the light, being thrown over both patient and operator. The fluoroscope...
Page 113 - ... sympathetic and pneumogastric in the neck, and down the •whole length of the spine from the first to the last vertebra. At that time we had used the method with the highest success, in hysteria, insanity, neurasthenia, gastralgia, dyspepsia, and certain diseases of the skin, and since that time this method has been extended to a wide variety of affections. In some diseases it has supplemented, in others it has supplanted...
Page 37 - If instead of introducing a permanent magnet within the helix we introduce a bar of soft iron, and move back and forth over one extremity of the soft iron one of the poles of a permanent magnet, the needle of the galvanometer is violently agitated, turning in one direction at each approach, and in the opposite direction at each departure, of the magnet. If the experiment is repeated with the opposite pole, the currents, as shown by the galvanometer, are reversed. If now instead of introducing into...
Page 33 - The gases, as can easily be proved, are oxygen and hydrogen, the hydrogen appearing at the negative pole, and the oxygen at the positive. The...
Page 266 - ... filling running down to the apical foramen. 15. To show the presence of fillings which encroach upon or enter the live pulp cavity. Where a filling is placed at right angles to the rays as they pass through the tooth, this condition is readily disclosed. If they happen, however, to be in whole or in part in the path of the rays as they pass through the root canal the skiagraph would not furnish conclusive evidence, since the shadow of the filling would be wholly or partially, superimposed upon...
Page 57 - That there is no collection of gas at either pole. When platinum terminals, connected with the secondary poles of an induction coil, are immersed in water, a momentary electrolysis takes place. The dissociated oxygen produces an oxide of platinum which is then reduced to metallic platinum by combination with the nascent hydrogen. This process takes place at both poles, so that both become covered with powdered platinum. As platinum has the power of occluding oxygen, it is probable that the gray appearance...
Page 266 - ... which will infallibly clear up all uncertainty. On the other hand, Figure 47 shows a wire which has been passed through a channel drilled between the lingual and buccal roots and passed up into the maxillary antrum. Antral empyema is no doubt frequently caused in this manner. Figure 48 shows a skiagram of root canals perfectly filled, the gutta percha filling running down to the apical foramen. 15. To show the presence of fillings which encroach upon or enter the live pulp cavity. Where a filling...
Page 239 - Trenkmann (1898) recommends the addition of a few drops of a ten per cent, solution of...

Bibliographic information