In-and-out. A term sometimes used for the scantline of the timbers, the moulding way, and particularly for those bolts that are driven into the hanging and lodging knees, through the sides, which are called in-and-out bolts.
Inner-post. A piece brought on at the fore side of the main-post, and generally continued as high as the wing-transom, to seat the other transoms upon.
Irons. A ship is said to be in irons, when, in working, she will not cast one way or the other.
Jack. A common term for the jack-cross-trees. (See Union.)
Jack-block. A block used in sending topgallant masts up and down.
Jack-cross-trees. (See Plate 1.) Iron cross-trees at the head of long topgallant masts.
Jack-staff. A short staff, raised at the bowsprit cap, upon which the Union Jack is hoisted.
Jack-stays. Ropes stretched taut along a yard to bend the head of the sail to. Also, long strips of wood or iron, used now for the same purpose.
Jack-screw. A purchase, used for stowing cotton.
Jacob's Ladder. A ladder made of rope, with wooden steps.