No. 58. A galvanoscope ([Fig. 72]) including a degree-card (No. 99). The cardboard coil-support, C S, is 5 × 6¼ in., and the hole in it is 3⅜ in. in diameter. The coil is 4¼ in. in diameter, made of No. 24 insulated copper wire.
No. 59. An astatic galvanoscope ([Fig. 77]). The whole may be taken apart and mailed in the containing box, B, which is 4⅜ × 3⅛ × 1 in. The coil is made of No. 31 wire, and has a resistance of about 5 ohms. Spring connectors are used to join a wire to the apparatus by pushing the connectors into the tubular binding-posts, L and R.
No. 60–63. Four strips of sheet zinc, 4 in. by ½ in., not amalgamated.
No. 64. A carbon rod, 4 in. long ([Fig. 81]).
No. 65, 66. Two glass tumblers ([Fig. 81]).
No. 67, 68. Two strips of sheet copper, 4 in. by ½ in. ([Fig. 85]).
No. 69. One galvanized iron nail.
No. 70, 71. Two wooden cross-pieces ([Fig. 85]).
No. 72. One dozen brass screws, ⅝ in. long, size No. 5, with round heads.
No. 73. A porous cup (P C, [Fig. 87]) that will stand inside of the tumblers (No. 65).