The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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SCIOPTICON MANUAL. 87 MISCELLANEOUS EXPERIMENTS. THE SCIOPTICON TANK (Fig. 28) is free from projecting clamps and so passes freely upon the stage in front of the condenser. It serves as a dry cage for insects, &c., a cell to show liquids and life in*water, a tank for the exhibition of chemical reactions, and with wires pro- tected and bent over the ends it can be used in connec- tion with a galvanic battery. It is the most convenient for the preceding experiments, as well as for these which follow. Fig. 28. COHESION FIGURES. —The cohesion figures known as Tomlinson's are both interesting and beautiful, and can be shown as follows: Fill the tank to within half an inch of the top with alcohol and slide it into place upon