A rotary-drilling bit that has serrated teeth. Also known as drag bit.
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DRAG
1. Short for WIRE DRAG. 2. The designed difference between the draft forward and aft when a vessel is down by the stern. 3. The retardation of a ship when in shallow water. 5. Short for ATMOSPHERIC DRAG
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NONGRAVITATIONAL PERTURBATIONS
Perturbations caused by surface forces due to mechanical drag of the atmosphere (in case of low flying satellites), electromagnetism, and solar radiation pressure.
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WIRE DRAG
An apparatus for surveying rock areas where the normal sounding methods are insufficient to insure the discovery of all existing obstructions above a given depth, or for determining the least depth of an area. It consists of a buoyed wire towed at the desired depth by two vessels. Often shortened to DRAG. See also DRAG -
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AIR RESISTANCE
Wind drag giving rise to forces and wear on structures.
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DRAG-CHAIN CONVEYOR
A conveyor in which the open links of a chain drag material along the bottom of a hard-faced concrete or cast iron trough. Also known as dragline conveyor.
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DRAG FACTOR
Ratio of hindered diffusion rate to unhindered rate through a swollen dialysis membrane. Also known as Faxen drag factor; hindrance factor.
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FLIGHT CONVEYOR
A conveyor in which paddles, attached to single or double strands of chain, drag or push pulverized or granulated solid materials along a trough. Also known as drag conveyor.
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HEAD SHAFT
The shaft driven by a chain and mounted at the delivery end of a chain conveyor; it serves as the mount for a sprocket which drives the drag chain.
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JET BIT
A modification of a drag bit or a roller bit that utilizes the hydraulic jet principle to increase drilling rate.
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OTTO-LARDILLON METHOD
A method of computing trajectories of missiles with low velocities (so that drag is proportional to the velocity squared) and quadrant angles of departure that may be high, in which exact solutions of the equations of motion are arrived at by numerical integration and are then tabulated.
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