but three have each of which sends a stream beside each crushing petitors, and in doing so proves the wisdom of the head-. This constant revolution of the machine is its progressed beyond the blue-print stage. One was con- method. Mr. Sigafoos ias always maintained that a structed and used with… … fields. Mr. Siga- front end view of tunneling machine showing catting heads. the rock, it being foos built his long acknowl- edged the hardest in the State. The photograph, show- first model three years ago, and until the present day wheels, thirty-two in all. The axles of these wheels— ing a…
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.
