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Scientific American, Vol. 64, No. 15 (1891) (1891)
leaf 3
from aside wall, and in the employment AN IMPROVED ASTRONOMICAL MIRROR. of extra hooks. The wall plate, also, has backwardly The accompanying illustration represents details of projecting spurs or teeth, to be driven into the wall to construction whereby concave mirrors of long focus temporarily… … iConvection is designed to be aided by means of cur- SCOTT’S PIPE HANGER, | © 1891 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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