. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. X.] GALVANOMETER SCALE. 109. Fig. 57.—Telescope and Scale. the boussole is placed a table, on which stands an astronomical telescope. Above the telescope, sup- ported on uprights, is a metre scale ss, which is divided into centimetres and millimetres. Each centimetre is marked with REVERSED numbers (Fig. 57). The table is so placed that the scale is directly opposite the mirror, and at right angles to the axis of the tele- scop
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. X.] GALVANOMETER SCALE. 109. Fig. 57.—Telescope and Scale. the boussole is placed a table, on which stands an astronomical telescope. Above the telescope, sup- ported on uprights, is a metre scale ss, which is divided into centimetres and millimetres. Each centimetre is marked with REVERSED numbers (Fig. 57). The table is so placed that the scale is directly opposite the mirror, and at right angles to the axis of the tele- scope. With a little trouble, the position of table and scale is so ar- ranged that, on looking through the telescope, the mirror of the boussole is seen, and the image of the scale reflected in it, the numbers of the scale being seen, of course, in the ordinary position. By adjusting the scale with a rack and pinion its 0 mark can be brought into the centre of the field, and made to coincide with the vertical thread of the telescope. The distant pulley (p2, Fig. 56) of the accessory magnet should be clamped to the telescope table. The slightest movement of it will cause a deflection of the needle, and this will be observed through the telescope, when it will appear as if the scale were drawn across the mirror. When the needle comes to rest, the reading, through the telescope, of the number now reflected in the mirror will indicate the amount of deflection. On the same table on which are placed the tele- scope and stand may be fixed keys and other arrange- ments, these being connected with the galvanometer by long wires, carried out of the way, overhead, to the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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