. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. thatthe jib A can be set up from it in an inclined positionacross the machine, with its outer end extending upto the top of the intended shear cut at the coal cutters are set to move in the direction of thearrows, Fig. 896, from the machine along the upperedge of the jib A, and towards the machine along theunder edge of the jib; and as the cutting proceedsthe crank frame I, K is gradually turned upwardsand over towards the coal face, whilst the jib A ismoved on the crank frame in such a way as to
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. thatthe jib A can be set up from it in an inclined positionacross the machine, with its outer end extending upto the top of the intended shear cut at the coal cutters are set to move in the direction of thearrows, Fig. 896, from the machine along the upperedge of the jib A, and towards the machine along theunder edge of the jib; and as the cutting proceedsthe crank frame I, K is gradually turned upwardsand over towards the coal face, whilst the jib A ismoved on the crank frame in such a way as to keepits outer end at the same height until it has pene-trated sufficiently far into the face. The crank frameand jib are then manipulated by means of the wormsS and P so as to move the outer end of the jib downin a vertical or more or less curved line until thebottom of the seam is reached; and afterwards theend of the jib A is worked outwards from the in-terior of the coal face in a direction as nearly hori-zontal as is convenient. It will be seen that the shearing operation can be.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
