Inside Out Library · Explore
Scientific American, Vol. 89, No. 21 (1903) (1903)
leaf 10
re in- 8 clined, and form abutments for steam passing through to be placed inside. As the door is closed the letter AN IMPROVED CONSTRUCTION FOR COHERERS, inclined ports in the ends of the piston. In operation receives an impression which tells the number and The coherer which is herewith… … special machinery. been invented by Thomas J. Johnson, of © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 89, No. 21 (1903)
More like this
