Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 340
upporting the tube G. This arm fits over arm Band is made level by having a block H glued to one end,corresponding in height to the thickness of B. Both the APPENDIX. 331 arms are pivoted at one end on the stem of the mirror-holder K. The mirror is fitted into a groove and thestem is made round and… … to a line from the centre of the hole to. the zero mark onedge of base. The two glass tubes should be paintedblack and must be fixed at exactly the same heightabove the baseboard and parallel with it. A vertical lineshould be drawn on the base of each arm directly underthe centre of the tubes. 332…
Physics
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