"Lapidary's Dial. A, section; B, side elevation; a, a, jaws; b, ball; c, tube; d, dial; e, cement rod; f, index; g, quadrant." —The Encyclopedia Britannica, 1910

Lapidary's Dial

"Lapidary's Dial. A, section; B, side elevation; a, a, jaws; b, ball; c, tube; d, dial; e, cement rod;…