Chapter II Glass-Grinding and Opticians’ Work **
§ 61. Details of the Process of Fine Grinding. — *
§ 62. Polishing. — *
§ 63. Centering. — *
§ 65. Preparing Small Mirrors for Galvanometers. — *
§ 66. Preparation of Large Mirrors or Lenses for Telescopes. — *
§ 69. The Preparation of Flat Surfaces of Rock Salt. — *
§ 70. Casting Specula for Mirrors. — *
§ 71. Grinding and polishing Specula. — *
§ 72. Preparation of Flat Surfaces. — *
§ 73. Polishing Flat Surfaces on Glass or on Speculum Metal. — *