. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. ore pressure and are not so safe. If a little more solidity is desired for the com- _ pressed tubing, the latter may be filled with fine sand after lilSlill 1m being screwed up to the proper tension. i , 11 Such tanks may be of any size and thickness of content,and a sufficiency should be pro-fig. 128.—Tank vided for the proposed series of experiments. Or the glass platesmay sometimes be more conveniently introduced into somesuch wooden frame as was shown in fig. Ill, p. 223 ; and therubber
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. ore pressure and are not so safe. If a little more solidity is desired for the com- _ pressed tubing, the latter may be filled with fine sand after lilSlill 1m being screwed up to the proper tension. i , 11 Such tanks may be of any size and thickness of content,and a sufficiency should be pro-fig. 128.—Tank vided for the proposed series of experiments. Or the glass platesmay sometimes be more conveniently introduced into somesuch wooden frame as was shown in fig. Ill, p. 223 ; and therubber tube then squeezed into place rather tightly, willreadily give a water-tight tank, only the glass and rubbercoming into contact with the fluid. Occasionally it will be needful to employ tanks madeentirely of glass, cemented together, according to the nature ofthe solution. For aqueous solutions, those sold as zoophytetroughs for microscopic use are convenient, and may be hadof almost any desired size; but for spirituous solutions marineglue must be replaced by other cements, such as are used in.
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
