The official measurements of the ship are as follows: length, 184 feet; breadth, 35.5 feet; depth, 16.2 feet; gross registered tonnage, 614 tons; maximum load displacement, about 1,500 tons. The backbone of the ship, viz. keel, main keelson, stem and stern posts, as also her frames, plank sheer, the waterways, and garboard strake, are white oak. Beams, sister keelsons, deck clamps, ’tween-deck waterways, bilge strakes, ceiling, and inner course of planking, yellow pine. Outer planking, white oak, and decks, Oregon pine. Both the ceiling and outer course of white oak planking are edge-bolted from stem to stern and from plank sheer to garboard strake. The fastenings are galvanised iron bolts, going through both courses of planking and the frames, and riveting up over washers on the inside of the ceiling. Special features of the ship are as follows: First, in model, a pronounced raking stem and wedge-shaped bow; very sharp dead rise of floor, affording a form of side which cannot be grasped by the ice; a full run to keep the ice away from the propeller; a pronounced overhang at the stern to still further protect the propeller, and a raking stern-post. Second, peculiarities of construction; the unusual fastening, as noted above; the unusual and massive arrangement of the beams, and bracing of the sides to resist pressure; the introduction of screw tie rods to bind the ship together; the development of the ’tween-deck beams and waterways on a water-line, instead of on a sheer, like the upper-deck beams; the placing of the ceiling continuous from sister keelson to upper-deck clamps, and the placing of the ’tween-deck waterways, deck clamps, and the bilge strakes on top of the ceiling; the filling in of the bow almost solid where it meets the impact of the ice; the massive and unusual reinforcement of the rudder post to prevent twisting; the adoption of a lifting rudder, which may be raised out of danger from contact with the ice; the armouring of the stem and bows with heavy plates of steel; the protection of the outer planking with a 2–inch course of greenheart ice sheathing. Peculiarities of rig are: pole masts throughout; very short bowsprit, which can be run inboard when navigating in ice of considerable elevation; three-masted schooner rig with large balloon staysails. The _Roosevelt_ carries fourteen sails, including storm staysails, and has a sail area somewhat less than that of a three-masted coasting schooner of the same size. Peculiarities of the machinery installation are: a compound engine of massive construction; an unusually heavy shaft of forged steel 12 inches in diameter; a massive propeller 11 feet in diameter, but with blades of large area, which are detachable in case of injury; a triple boiler battery; arrangements for admitting live steam to the low-pressure cylinder, in order to largely increase the power for a limited time; an elliptical cruiser-type smoke-stack to reduce wind resistance.