, true that when a new invention is " to investigate a coral reef by sounding and boring," PORTABLE ELECTRIC RAIL SAWING MACHINE. introduced which revolutionizes some particular art or and is to do so with a mind quite unbiased as to the branch of business, it at first decreases the number of We… … to be very efficient and decade from 1870 to 1880 PORTABLE ELECTRIC RAIL SAWING MACHINE. economical, sawing off the the population increased end of a 66J^ pound girder 30'08 per cent, while the rail in one minute. The total cost of sawing rails is number of persons employed increased 30 per cent.…
Patents · Feet · Adapted · Munn · Brooklyn · Scientific American · Apparatus · Piston rod · Live steam · Postal union · Years ago · Main driving · Western civilization · East river · Hung chang · Horse power
Internet Archive · Public domain (published before 1931). Free to use for anything.
