1. The difference between the theoretical distance traveled per revolution of a vessel's propeller and the actual advance of the vessel. 2. The motion of the center of resistance of the float of a paddle wheel or the blade of an oar through the water horizontally. 3. The difference between a vessel's actual speed and the speed it would have if the propelling instrument acted upon a solid. 4. The velocity relative to still water of the backward current of water produced by the propeller. 5. A memorandum of the particulars of a risk for which a policy is to be executed, usually bearing the broker's name and initiated by the underwriters.

Related Terms


The conversion of energy arising from the temperature difference between warm surface water of oceans and cold deep-ocean current into electrical energy or other useful forms of energy. Abbreviated OTEC.


An instrument in which a motor-driven slide wire in a measuring circuit is continuously adjusted so that the voltage or current to be measured will be balanced against the voltage or current from this circuit; a pen linked to the slide wire makes a graphical record of its position as a function of time.


The current which flows in a network when the output is open-circuited.


A calorimeter for measuring specific heats at low temperatures, in which the heat reservoir consists of a metal of high thermal conductivity such as copper, to promote rapid temperature equalization; none of the material under study is more than a few millimeters from a metal surface, and the whole apparatus is placed in an evacuated vessel and heated by current through a platinum heating coil.


An increase in current flow through a semiconductor because of increased carrier activity.


A field-effect transistor in which appropriate voltages are applied to the gate to control the space within the current flow channels.


[ENG ACOUS] A loudspeaker in which the mechanical forces result from reactions between a steady magnetic field and the magnetic field produced by current flow through a moving conductor.


Any galvanometer, such as the d'Arsonval galvanometer, in which the current to be measured is sent through a coil suspended or pivoted in a fixed magnetic field, and the current is determined by measuring the resulting motion of the coil.


A type of thyristor in which there is a very thin metal oxide semiconductor (MOS) integrated circuit in the top surface of the high-power thyristor components, so that only a small gate current is needed.


A delay cap with an extremely short (20500 thousandths of a second) interval between passing of current and explosion. Also known as short-delay detonator.

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