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356 on 80 Ib. pressure and 35 cu, ft. of free air. Fig. 80 shows plan of drift pin, a very useful but much abused tool. This tool is a tapered steel pin and is very helpful in assembling of the plates and Fig. fo. shapes, which is well known to the ship builder. Sometimes the drift pin is used in fairing the holes, but it leaves a burr on the plate and makes it impossible to «6closeé' up the material: The drift pin was very detrimental to iron, for when it was forced into the hole it cracked and burst the material at the Oe O O O O O Fig. 8. rivet hole, Good steel is not injured by drifting, for tests have shown that a steel 'plate*can stand the enlarging of the hole to twice its diameter with- out showing any signs of fracture, as shown in Fig. 81. 'As stated elsewhere in this issue by Robert Curr, in his excellent series of articles on "Lake Ship Yard Methods of THe Marine REVIEW Steel Ship Construction," "the mold sys- tem of work creates a greater percentage of unfair holes than the old style of lifting the plates from the ship, which of course increases the cost of reaming. September, 1909 vessel was 90.3 per cent completed, The Fore River Co. announces that the casement armor for which it has been waiting since last November, has at last passed test and will be delivered BatttesHip NortH Daxkota on Aue. I. The extra cost in reaming is a small matter compared to the advantages ob- tained by the mold system and a tool -like a combined reamer and _ counter- sink must be a great saving in time at the same cost as compared with the changing of tools to do counter- sinking." BATTLESHIP NORTH DAKOTA. Herewith are published two photo- graphs of the battleship North Dakota, taken on Aug. 1, at which time' the SHow1nc Her 90.3 Perr Cent COMPLETED. during September. The company is preparing to hold the official trial of the battleship in October. SOCIETY FOR TESTING MA- TERIALS. It should have been stated that the standard specifications for open hearth boiler plate and _ rivet steel, and for structural steel for ships published in the August issue of Ture Marine Re- VIEW, were taken from the proceedings of the Society for Testing Materials. BATTLESHIP NortH DAKoTA on Aua.1 1,.SHowina Her 90.3 Per Cent CoMmPLeten.