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September, 1914 between the deck and first longitudinal frame below the shear strake. ©The shear strake is 48 inches by .526 inches and by deducting 9 inches for rivet holes at bulkhead there is an area: of 20.5 square inches equal to 533 tons. 550 ----=36 Rivets % inch diameter, 15 Fig. 8 shows 16 rivets in double shear and 14 in single shear amounting to 642 tons which is more than necessary but THE MARINE REVIEW thick. There are 12 rivet holes across the bulkhead leaving 60 inches by 9/16 inches = to 34 square inches 884 tons: 884 ----=59 Rivets for single shear. In AS the butt strap there are 28 rivets in double shear and 19 in single shear, making a total strength of rivets of 1,041 tons. The lapped butt arrangement in Fig. 11 has 62 rivets single shear which 341 diameter for, treble, 13., diameter for double and 7 diameter for single. Lapped butts require for quadruple 14 diameters, treble 1014, double 7 and single 4 diameters. Double seam laps are 6 diameters of the rivets. Single seam laps are 314 diameters of the rivets. At the recent convention of the National Association of Steam Engin- \ io o| ay | o| Oye ele 6.8 ee ee LOS ee ee 10 0 O]0 0 O roy Re | lo olo o jo | | Le ~Aeo}°. 9 | Lo 19 0 0,0 0 0, | | u ; |e) N10 O10 Ie | o} 6 | Ll 0.0,0 6 | | lo | ° O | Ov O20. © | | ee oleae Gal Os 2 AS = -- --t oa : ise I 0 0,0 0 | ba 0 00:0 es | | | i ek: --Fig, BAS Fic.8, it is no more costly than the single butt Strap for there are eight rivets less than there would be in a single butt strap arrangement. Fig. 10 shows a lap arrangement which is very much cheaper than the butt strap as there is only half the number of rivets and half the ma- terial, Fig 11 shows a double butt strap atrangement on the stringer plate Which is 72 inches _by 9/16 inches shows the most economical arrange- ment for there is only half the ma- terial and 32 less rivets. A quadruple riveted butt with a single strap could be arranged but the lapped butt is the cheapest arrangement. A single butt strap for the stringer plate would be .70 inch and for double strap .42 inch countersunk and under strap .34°inch thick. The width of butt straps run 25 diameters for quadruple riveted, 19 veeees IG FO aces eers held at Providence, R. I., the Johns-Manville Co. had an _ interesting exhibit of power plant material. A new packing called J-M_ Seigelite attracted attention. This is a fibrous material treated so that it is said to be un- affected by the action of hot or cold water, oils, grease, gasoline, benzine or air. It contains no rubber or rubber substitutes. When immersed in water it is said to become extremely tough, resembling rawhide. ;