Rick Van Anken, who blows the snow from some of the 250 miles of sidewalks in Bloomington, Minn., used to worry about being injured if his vehicle hit a quarter-inch irregularity in the sidewalk and ...

An underwater ship -- A siphon for raising water -- Lifting weights by water, and a portable siphon -- Construction of sluices to raise ships to any height -- A machine worked by fire which can throw ...