with the leading authorities,is considered at 40 lbs. per superficial foot as a maximumload in our climate. On the day of the falling of this struc-ture, your article says, there had been a light fall of snow,I question if the weight on theroof, at the time, exceeded 20 lbs. per foot, as snow is… … The great pyramid, which is seven hundred feet squareand five hundred high, and weighs 12,760,000,000tuns, re-quired, according to Herodotus, the labor of 100,000 men fortwenty years to build it; but Dr. Lardner affirmed that 480tuns of coal with an engine and hoisting machiae would haveraised…
Patents · Iron · Tuns · Machine · Heat · Specific heat · Wrought iron · Wood flume · Scientific American · Second third · Hot air · Gun cotton · Transverse strain · Beet sugar · Portable steam
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
