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A lengthening of shafting caused by thermal changes in environment.

Related Terms

TAILSHAFT

A kind of metallic shafting (a rod of metal) to hold the propeller and connected to the power engine. When the tailshaft is moved, the propeller may also be moved for propulsion.

APPENDAGES

Structures extending beyond the main hull. They include items like shafting, rudder, bossing, struts and bilge keels.

BIMETAL ELEMENT

A strip or coil that consists of two different metals having different thermal expansion rates that are bonded together.

BIMETALLIC THERMOMETER

A temperature measuring instrument in which the differential thermal expansion of thin, dissimilar metals, bonded together into a narrow strip and coiled into the shape of a helix or spiral, is used to actuate a pointer. Also known as differential thermometer.

DEFORMATION

Any alteration of shape or dimensions of a body caused by stresses, thermal expansion or contraction, chemical or metallurgical transformations, or shrinkage and expansions due to moisture change.

GRAHAM'S PENDULUM

A type of compensated pendulum having a hollow bob containing mercury whose thermal expansion balances the thermal expansion of the pendulum rod.

HARRISON'S GRIDIRON PENDULUM

A type of compensated pendulum that has five iron rods and four brass rods arranged so that the effects of their thermal expansion cancel.

HOLLOW SHAFTING

Shafting made from hollowed-out rods or hollow tubing to minimize weight, allow internal support, or permit other shafting to operate through the interior.

LINE SHAFTING

One or more pieces of assembled shafting to transmit power from a central source to individual machines.

LIQUID-IN-GLASS THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.
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