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A Treatise on Diseases of the Nervous System
A Treatise on Diseases of the Nervous System Author:William Alexander Hammond Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. Excerpt from book: Section 3the lever is thus moved, and the plate with the paper is carried along by the cog-wheel. As it moves, the pencil traces a line on the paper, the height and regularity of which depend upon ... more »the firmness and steadiness with which the dynamometer is pressed. As seen in the cut, the plate with the paper is in motion, and has about half completed its conrse. The patient should not look at the paper while using the instrument. The dynamograph, therefore, writes down the muscular power and tone of the individual, and likewise indicates the perfection of what is sometimes called the muscular sense. A person in good health will make a straight line with the pencil. If there is paralysis of the muscles of the arm, or incoordination to the slightest possible extent, the line will be irregular. The papers used may be marked with the date and the name of the patient, and thus a record of his condition is preserved. The pencil should be of the very softest lead, and the paper should be rough and unsized.1 Duchenne's Trocab. This very useful little instrument is shown in Fig. 4. It is introduced open as at textit{a. When it has perforated the muscle under examination, the small button at the under part of the handle is pushed forward ; this propels a half- cylinder of steel against the shoulder at the end of the tro 1 The first account of the use of the dynamograph was given by myself in the Journal or Psychological Medicine, January, 1868, p. 139. Section 4car, and thus a small piece of muscle is detached and caught in the cavity. The lower figure textit{b represents the instrument ready to be withdrawn. By drawing the button back, the bit of fibre can be taken out, and is then ready for microscopical examination. ELECTRICAL APPARATUS. The electrical apparatus required in the diagnosis and ...« less