driver boom

Naut.: The boom to which the driver is hauled out. IMG:content-0549.png:[blocks in formation] sages through the rocks, . II. Min .: The cutting of drifts or horizontal pas- driving-axle, s. Mach .: The axle of a driving-wheel; the bearing [Eng. driv(e); portion rests in the driving-box. The weight of 1. One who or that which drives; the person or thing which applies force to urge or compel any person or thing forward. "A drove of sheep, or an herd of oxen, may be managed by any noise or cry which their driver shall accustom them to."- South : Sermons, vol. ii., ser. 9. 2. One who drives a carriage or other vehicle or an engine. *3. One who aims or strives at any certain object. "A dangerous driver at sedition." -Mountagu : Devout E ays. II. Technically : 1. Blast .: The copper bar by which the tamping is driven around the pricker on to the charge in a blast-hole; a tamping-iron. the hoops of casks, its tooth resting on the hoop. 2. Cooper.: A tool used by coopers in driving on 3. Machinery: (1) The wheel of a locomotive to which the power is communicated. A pair of drivers are arranged on an axle, their cranks or wrist-pins being at an angle of 90°, so that one is always at an advantageous position for duty, relatively to the piston, Several pairs of drivers are coupled together by connecting-rods; a driving-wheel. (2) In gearing, the main-wheel by which motion is imparted to a train of wheels. A master-wheel. (3) A drift for enlarging a hole or giving it an angular shape not attainable by a drill. [DRIFT.] in conjunction with the bed, bottom, or bolster, (4) A stamp or punch, the salient tool which acts through whose aperture the excised piece of plate is driven. 4. Mill .: The term is applied to that which communicates motion, as the cro -bar on the spindle by which motion is communicated to the runner of a grinding-mill. A peg, catch, tappet. that portion of the engine is supported by a driving-spring upon the box. driving in nave-boxes. driving-bolt, s. A wheelwright's tool used for