Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 647
he upper extrem- 624 EXPERIMENTAL SCIENCE. ity. The tube at the outer end of the spiral is bent out-ward radially, then downward at right angles. The tubethus bent is mounted on a board having a circular aperturea little larger than the spiral, so that the entire spiral maybe strongl)^ illuminated,… … Circulating Fountain for Projection. wooden rod which extends down into the tube at the lowerend and forms a valve for regulating the flow of liquid. The liquid employed is water to which has been addedsome coloring matter, such as aniline blue, red, or green.A few drops of aniline red ink answers…
Physics · Lantern projection · Electric apparatus and appliances
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