ed with sand, or between layers to the side bprs, makes less joints for wear and prevents the coarse sand, 15 parts spongy iron mixed with one-third its of sand and gravel, so long used for filtering purposes, has a swing of the body forward and backward that would other- bulk of fine gravel, laid… … white miners average $2.35 cents per day, the and one-half the depth of the top layer, and re men boarding themselves. Blacksmiths and placing with fresh sand.. other mechanics and overseers are paid $4 per The double filter cistern. Pig. 3, has much to ^M day. The Great Eastern mine employs 35…
Patents · Patented · Iron · Inventors · Scientific American · Fossil meal · Fire escape · Years ago · Thrashing machine · Steam fire · Net tons · Fire engines · Address munn · Compound oxygen
Internet Archive · Public domain (published before 1931). Free to use for anything.
