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Zoe construction of mercantile vessels will be advantageous to all concerned. The dimensions of the frames are determined from the tables by using the frame number in association with the depth from the lowest tier of beams to the top of the floors. This arrange- -ment renders unnecessary the introduc- tion of tiers of beams at certain speci- fied depths of ship; for, if a tier of beams be dispensed with the frames will be suitably increased, due to the increased height of the lowest tier of beams, while if an additional tier of beams be introduced the frames will be correspondingly | reduced. The "ordinary framing" and "deep framing" are consequently. no longer used. The 'present "three-deck" rule is also un- necessary, as the framing receives due -- consideration when another tier of beams is fitted, without any modifica- tion of the framing number as at pres- ent. The spacing of the frames from the after peak bulkhead to the fore peak bulkhead is regulated by the frame num- ber, and amounts to 33 in. in the larg- est vessels; but in no case does the frame spacing exceed 27 in. from the collision bulkhead to one-fifth the ves- sel's length from the stem, unless dou- ble frames are fitted at that part. In the peaks the frame spacing in no case exceeds 24 in. There are three framing tables, one giving the dimensions of frames when made up of frames and reversed frames riveted together, another giving frames when formed of single angles, bulb angles, channels, or channels with reversed frames, the third gives the dimensions and spacing of web frames and side stringers in combination with intermediate transverse frames. The requirements as to outside plat- ing, decks, etc, are given in two ta- bles, one showing the thicknesses of out- side plating, steel decks (other than tipper decks), beam stringers, etc., also the scantlings required for short deck erections; the other giving the scantlings of the topsides, upper deck plating and stringer, and of long bridges, for pro- portions of depth to length ranging to 14 depths. ' The beam tables are extended to in- clude larger vessels than at present provided for, and the thicknesses have been adjusted in decimal thicknesses. There are two tables for double bot- toms, one giving the scantlings and the other the varying breadths of margin plate required in each framing grade for the increased framing as the depth to lowest tier of beams increases. The latter also shows the corresponding at- tachments of gusset plates, etc., at the margin plate. terms -- the. THe MARINE REVIEW & The other tables have been amended, and care has been taken to increase the riveting efficiency wherever experience has shown it to be necessary. The text of the rules has been re- arranged, and rewritten so as to con- form with the tables as. amended. The rules and tables provide scant- lings for only one grade of classifica- tion, viz.: 100A, but should a ves- sel be built with suitable scantlings, but 'Shallow Draught River Steamers for South America LIMATIC conditions in South America have provided an im- portant market for steel hull steam boats designed for -and passenger vessels, "August, not quite equal to those required for the 100A class, she may, if the committee -- approve, be classed 90A. In addition to the revision of the rules for the construction of cargo rules have also been prepared for the construction of vessels intended for carrying petroleum in bulk, these rules being based upon the society's long-established practice in the classification of such vessels. freight and passenger service upon the local streams. Craft of wooden construction ate, it i$ Said, sq. affected 'by the climate as to make ~ Cross Section Looxinc Forwarp.