. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . of thecasing without preventing the casing from turning. By further manipulation the casing be-comes stationary and forces the bit-rod outward, thereby causing thebit-members to expand. When thepocket has been properly formed,the bit-rod is drawn backward, thebit assumes its normal position, andmay be readily removed from thehofe. ne Jeffrey Positive-Feed Coal-Drill consists of a small rotary en-gine hung in an upri
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . of thecasing without preventing the casing from turning. By further manipulation the casing be-comes stationary and forces the bit-rod outward, thereby causing thebit-members to expand. When thepocket has been properly formed,the bit-rod is drawn backward, thebit assumes its normal position, andmay be readily removed from thehofe. ne Jeffrey Positive-Feed Coal-Drill consists of a small rotary en-gine hung in an upright frame, hav-ing joints at top ami bottom to by adjustnig screws with themol anil floor of the mine. This issiip|)orted by a dog or bra((\ to stilT-tu .ind hohi the frame rigid as the;iuger bit advances into the coal,iower is transmitted to this auger-iiit or feed-bar through two gear-wheels. Attached to the engine arcteed-nuts that open and close uponI he feed-screw, which is 4 to 5 ft. inImgth, on one end of which is a-ipiare socket, into wliich is insertedI he s(|uare end of the bits are used for convenience,one ;! ft. and the other (i ft.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
