Chapter 2

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.