Epilepsy and other convulsive affections : their pathology and treatment / by Charles Bland Radcliffe.

  • Radcliffe, Charles Bland, 1822-1889.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: Epilepsy and other convulsive affections : their pathology and treatment / by Charles Bland Radcliffe. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    sensitive instrument, of which some particulars must be mentioned. In this instrument, the frame upon which the wire is coiled, the arch from which the needles are suspended, and the screws for receiving the ends of the coil, are fixed on a circular plate which can be rotated upon a central axis. The sides of the frame are 4-6 inches long, 3T inches high, and T6 of an inch apart. The depth of the space in which the lower needle swings, is OT of an inch. The copper wire forming the coil is 5584 yards, or 3T7 English miles in length, and about ‘0055 of an inch in diameter. The number of coils is no less than 24,160. The needles are cylindrical with each end sharpened out into a long point. They are 1 *5 of an inch in length, -03 in diameter, and the weight of the two is 4 grains. They are connected by a thin piece of tortoise-shell, nearly 1-6 of an inch in length, and weighing not more than 09 of a grain. Away from the coil, the astatic system was adjusted so as to make a single vibration in 33 seconds. Each end of the coil is connected with a peculiar electrode which requires to be described in order to make some of the following remarks intelligible. This electrode consists of a horizontal arm, a pair of platinum plates, a glass trough con- taining a saturated solution of common salt, a cushion of blotting paper (of which the upper end