rinding.

Sec. 62. Polishing.

Sec. 63. Centering.

Sec. 65. Preparing Small Mirrors for Galvanometers.

Sec. 66. Preparation of Large Mirrors or Lenses for Telescopes.

Sec. 69. The Preparation of Flat Surfaces of Rock Salt.

Sec. 70. Casting Specula for Mirrors.

Sec. 71. Grinding and polishing Specula.

Sec. 72. Preparation of Flat Surfaces.

Sec. 73. Polishing Flat Surfaces on Glass or on Speculum Metal.

CHAPTER III.

MISCELLANEOUS PROCESSES.

Sec. 74. Coating Glass with Aluminium and Soldering Aluminium.

Sec. 75. The Use of the Diamond-cutting Wheel.

Sec. 76. Arming a Wheel.

Sec. 77. Cutting a Section.

Sec. 78. Grinding Rock Sections, or Thin Slips of any Hard Material.

Sec. 79. Cutting Sections of Soft Substances.

Sec. 80. On the Production of Quartz Threads.

Sec. 84. Drawing Quartz Threads.

Sec. 86. Drawing Threads by the Catapult.

Sec. 87. Drawing Threads by the Flame alone.

Sec. 88. Properties of Threads.

Sec. 90. On the Attachment of Quartz Fibres.

Sec. 91. Other Modes of soldering Quartz.

Sec. 92. Soldering.

Sec. 94. Preparing a Soldering Bit.

Sec. 95. Soft Soldering.

Sec. 97. Soldering Zinc.

Sec. 98. Soldering other Metals.

Sec. 99. Brazing.

Sec. 100. Silver Soldering.

Sec. 101. On the Construction of Electrical Apparatus--Insulators.

Sec. 102. Sulphur.

Sec. 103. Fused Quartz.

Sec. 104. Glass.

Sec. 105. Ebonite or Hard Rubber.

Sec. 106. Mica.

Sec. 107. Use of Mica in Condensers.

Sec. 108. Micanite.

Sec. 109. Celluloid.

Sec. 110. Paper.

Sec. 111. Paraffined Paper.

Sec. 112. Paraffin.

Sec. 113. Vaseline, Vaseline Oil, and Kerosene Oil.

Sec. 114. Imperfect Conductors.

Sec. 116. Conductors.

Sec. 117. Platinoid.

Sec. 119. Platinum Silver.

Sec. 120. Platinum Iridium.

Sec. 121. Manganin.

Sec. 122. Other Alloys.

Sec. 123. Nickelin.

Sec. 124. Patent Nickel.

Sec. 125. Constantin.

126. Nickel Manganese Copper.

CHAPTER IV.

ELECTROPLATING AND ALLIED ARTS.

Sec. 127. Electroplating.

Sec. 128. The Dipping Bath.

Sec. 130. Scratch-brushing.

Sec. 131. Burnishing.

Sec. 132. Silver-plating.

Sec. 133. Cold Silvering.

Sec. 134. Gilding.

Sec. 135. Preparing Surfaces for Gilding.

Sec. 136. Gilding Solutions.

Sec. 137. Plating with Copper.

Sec. 138. Coppering Aluminium.

Sec. 140. Alkaline Coppering Solution.

Sec