Twin Propellers. Twin screws.
Twin Screw. Said of a vessel having two propellers.
Twin Screws. Pair of screw propellers, one on either side, which rotate in opposite directions when propelling a vessel. Introduced in 1888.
Twist Knot Plait knot.
Twitching Line. See 'Twiddling Line'.
Two Blocks. Said of a purchase or tackle when it has been hauled upon until its two blocks are touching one another.
Two-Stroke Cycle. Charging and compression on one stroke, ignition and scavenging on second stroke, of an internal combustion engine.
Two-Stroke Engine. Internal combustion engine having a power impulse on alternate strokes.
Tye. Rope by which a yard is hoisted. Usually rove through a sheave on mast.
Tye Block. Special iron-bound block shackled to a yard. Tye is rove through it to obtain extra purchase.
Typhoon. Violent cyclonic storm prevalent in seas around China, Japan, and the Philippine Islands.
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