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34 The connection of the bottom frame angles at the center line, and with the side frames above the bilges, must be efficient and satisfactory to the Com- mittee. 3. At the extreme ends of the vessel the frames should be in one uniform length, overlapped at the keel and securely riveted to each other. 4. Where flat plate keels and vertical plate keelsons are fitted, the frames may end at the center line and be secured to the vertical keelson plate in conjunction with floor plates by suitable bracket plates riveted to the floor plate and to the keelson plate between vertical angle bars of size given in Table 4. 5. The frames must extend to the upper deck stringer plate, also to the stringer plate of all raised forecastles, poops, and quarter decks when such erec- tions are fitted. 6. All rivet holes to be punched from the faying surface after the frames are moulded, and holes in way of landings of plating to be drilled after the plates are fitted. 7. Forward and aft for one-sixth the vessel's length each end, a reduc- tion in the frame section will be allowed as provided for in Table 3, providing it does not include the machinery or boiler space. See Par. 12, this Section. 8. When it becomes necessary to butt frames they must be connected by a bar of the same section, and of a length to admit of three rivets on each side of the butt spaced 6 inches apart. 9. Frame angles must be doubled at all collision bulkheads. 10. Other watertight bulkheads may be fitted to single angle or channel bar frames, providing the flange of the frame is sufficiently wide to admit of double riveting the bulkhead plating thereto. 11. No reduction from the tabular midship frame section will be permitted in the after end of screw steamers; and where the average speed is fourteen miles and above, in addition to full weight of body frames, intercostal plates should be fitted, projecting above the frames and connected to double reverse longitudinal angles as a stringer abaft the stuffing box bulkhead. 12. In steam vessels the frames in the engine and boiler space must be of the full tabular size and weight. 13. Intermediate frames of the size required for angle frames in Table 3 should be fitted between the regular frames forward of the collision bulkhead in RULES FOR THE CONSTRUCTION OF STEEL VESSELS. the fore peak, and extend to the second deck bindings in two deck vessels and above the deep load line in single deck vessels. REVERSE FRAMES. SECTION 22. 1. When the ordinary angle frames are adopted, reverse angles of the size given in Table 3 are to be fitted to each frame. See Par. 5, this Section. 2. The reduction for ends given in Table 3 will not be allowed in the after end of screw steamers. 3. The tabular reduction will be allowed on sailing vessels, barges, and side wheel steamers for one-sixth the vessel's length at each end. 4. Where frames of the tabular Z-bar bulb or channel bar are adopted, the reverse angles on top of floors must be efficiently connected with the side frames. 5. When ordinary angle frames are adopted, the reverse angle must be fitted to every frame below the second deck, and extend to the upper deck stringer plate on every alternate frame. 6. When ordinary frames, spaced 24 inches, extend to the stringer plate of deck erections, such as raised forecastles, quarter decks and poops, and the combined length of these erections are equal to one-half the vessel's total length, the reverse bars should be fitted on every alternate frame within the erections and extend to their stringer plate angles. 7. In awning deck vessels reverse bars on every frame must be carried up to the stringer plate of the deck next below the awning deck, and alternately to awning deck stringer plate in way of any erections on awning deck. 8. In sailing vessels, propelled by their own canvas, where the sum of their breadth and depth exceeds 60 (measured in accordance with Pars. 3 and 4, sec. 7), the reverse bars should be fitted to every frame and extend to the upper deck. 9. In steam vessels where the sum of breadth and depth to the upper deck exceeds 35, the reverse angles in way of machinery space and paddle boxes of side wheel steamers should be fitted to every frame and extend to the upper stringer plate, or if desired web frames instead of reverse bars may be fitted if approved by the Committee.