For instance, let us take a round bar of timber; it is now in its strongest state, but suppose we saw a thin strip off one sido, as is ... 1 believe there has been a printera#39;s error in tho weight of coal as given in the answer. ... of water in a mine, the depth of which is 120 yards, when an engine, 80 h.p. . began to pump the water which was cleared after 21. Vol. ... In order to do this you want tho size of the fire-box and up-take tube, also whether there are any cross-tubes in the up- take tube or not.