DICTIONARY OF

Taut Bowline 347 Telescopic Funnel
Taut Bowline. Said of a bowline when it is fully stretched with ship sailing closed hauled.
'On a taut bowline' denotes a vessel sailing close hauled and as near to wind as possible.
Taut Leech. Said of a sail when well hoisted and having no tendency to 'bag'.
Taut Wire Measuring Gear. Used in surveying ships to indicate an exact distance run.
About 140 miles of pianoforte wire is carried on a drum, one turn being led round a 'counter'
wheel having a circumference of .01 of a cable, 0.001 of a mile. End of wire is weighted and
lowered to sea-bed. As ship goes ahead, the wire is allowed to go out. Number of revolutions
of 'counter' wheel is registered, thus giving a distance. Accuracy is within 0-2 per cent.
Tavistock Theodolite. Instrument used for precise measurement of angles in marine
surveys.
T-Bar. Rolled steel section of T-shape.
Tchebycheff’s Rule. For finding area of a figure bounded by straight lines and a curve.
Ordinates are drawn to suit shape or curve, their mean value being multiplied by length of
base line. Used as an alternative to 'Simpson's Rules'.
Teak. Valuable and important wood grown in India and Burma. When seasoned, will not
warp, split, crack, or alter shape. Is not injured by contact with iron, is easily worked and is
not attacked by ants or other insects. Specific gravity, 0.64.
Team Boat.* Ferry boat having paddles worked by a team of horses.
Tee Bar Bulbed. Tee bar with bulb along lower edge.
Teem. To pour. To empty.
Telegraph: Engine-room or Docking Telegraph. A mechanical or electrical device which,
on a lever being moved, transmits or acknowledges orders for engine movements or
handling of ropes.
Telegraph Men. Hands stationed on bridge of a steam, or motor, vessel to work engineroom
telegraphs as ordered.
Telegraph Ship. Vessel specially constructed for laying, picking up, or working on, a
submarine telegraph cable.
Telemotor. Steering-gear which controls a steering engine by hydraulic pressures set up by
movements of the steering-wheel.
Telescope. Optical instrument for magnifying image of distant objects, so making them to
appear nearer. Crude form was in use before 1570. In 1608, two Dutch spectacle makers,
Jansen and Lippershey, made three instruments 'for seeing at a distance'. Galileo improved
on these by using double concave eyepieces. Kepler introduced convex eyepiece. Lightcollecting
power depends entirely on area of object glass. Different types include terrestrial,
refracting, reflecting, and prismatic telescopes-and the periscope.
Telescopic Funnel. Funnel that can be lowered vertically, either entirely or in sections.
Originally used in vessels having sails and engines. Now confined to small craft that pass
under bridges.