. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. apparatus, and Fig. 902 isan enlarged view of the upper part ofFig. 901; a is the framework which issecured in position, between the floor androof, by the screws 6 6; c is a sliding barsecured to the framew^ork by the set screwd, which bar allows of a greater range ofadjustment than is permitted by the screw^sb b. The boring bar e is formed of apiece of square iron or steel, and passesthrough a square hole in the toothed wheel/. The driving wheel g is operated by the crank handle h; motion from g to f bein
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. apparatus, and Fig. 902 isan enlarged view of the upper part ofFig. 901; a is the framework which issecured in position, between the floor androof, by the screws 6 6; c is a sliding barsecured to the framew^ork by the set screwd, which bar allows of a greater range ofadjustment than is permitted by the screw^sb b. The boring bar e is formed of apiece of square iron or steel, and passesthrough a square hole in the toothed wheel/. The driving wheel g is operated by the crank handle h; motion from g to f being com-municated by the intermediate wheel i. This arrangement of gearing allows of the boring barworking close to the roof of tlie mine, j is a nut, through which the screwed sleeve k works ; thescrewed sleeve k being attached to and caused to rotate with the boring bar e by the set screws /.The boring bar e can be adjusted to the face of the work, or removed therefrom, by loosening theset screws I and sliding the bar in or out ; to save time, when the boring bar has worked into the.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
