Scientific American Volume 20 Number 24 (June 1869) . nan incline so as to allow the water to run off from them. 3. Carry the bones to a crashing mill or to a stamp mill,and them to the size of a hickory nut. If this bo donebetween revolving, horizontal cylinders, these must havesharp-edged ridges about three-quarters of an inch broad ontheir outer surfaces. 4. Keceive the crushed bones on a bottom formed of parallelrods which will allow fat and marrow to ooze through, with-out giying passage to the bone. 5. Place, the crushed bones in wicker baskets in large vatsor tanks, and cover th
Scientific American Volume 20 Number 24 (June 1869) . nan incline so as to allow the water to run off from them. 3. Carry the bones to a crashing mill or to a stamp mill,and them to the size of a hickory nut. If this bo donebetween revolving, horizontal cylinders, these must havesharp-edged ridges about three-quarters of an inch broad ontheir outer surfaces. 4. Keceive the crushed bones on a bottom formed of parallelrods which will allow fat and marrow to ooze through, with-out giying passage to the bone. 5. Place, the crushed bones in wicker baskets in large vatsor tanks, and cover them with water, the temperature ofwhich must be from 120° to 140° Fall., and no more. 6. Skirn the fat as it forms from the top of the warm water,and it is then ready, after mixing with alkalies to be boiled,into soap. If the bones! unlbeenboiled, the soap obtained wouldcontain glue, be of inferior quality, dark-colored, and badscented. 7. Take the baskets and their contained bones from thegrease vats, and let them drip, after which suspend them in. rowing cut. The bottom plate which supports the bones is perforated liy small holes, andis surmounted by a pipe whichreaches above their surface inthe pan, so that when the waterin A begins to boil it runs outthrough the top of the pipe, B,and liowsoverand through themass of bones in a perpetuallycirculating stream. In largeworks the operation is per-formed in successive boilers, ineach of which the degree ofconcentration is increased. 15. When boiled down to the proper consistency, run outthe glue in flat, wooden molds, three feet long by one footbroad, which must be washed and wetted before the introduc-tion of the glue. 16. Take up the glue sheets from the molds with a knifeslipped under them, and cut it crosswise into six or sevenlengths by means of a special glue cutter. 17. Dry your glue on twine netting, the strands of whichmust bo yljj inch in diameter. The netting is stretched onframes 6 feet long and 1-J feet broad. The t
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