long, 6 inches in This huge frame holds ten crushing heads, as the diameter, and composed of a specially chilled inch single lever. photograph shows, each carried on a 4-inch horizontal steel. These cutting or crushing heads, as they should The time and money to be saved by this practical shaft and… … Face of tunnel as punched out by the machine. The machine set op to start a tunnel Into a hillside. THE 8IGAE00S TUNNEL MACHINE.
Patents · Munn · Peat · Cave · Machine · Producer gas · Scientific American · Mail bag · Guide map · Mammoth cave · Tbe address · Lock canal · Main cave · Wireless telegraph · Hot water
Internet Archive · Public domain (published before 1931). Free to use for anything.
