The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

'Isherwood System of Construction Migs 1 with" this "article «stows "a seven-frame space section of trans- verse framed vessel. Fig. 2 shows the Isherwood sec- . tion with the plating above the bilge removed. This section is 12 feet 834 inches long above the tank, but in the tank the transverses are only half that dis- tance apart. Fig. 3 shows the cross section cut off at the water line which is 13 feet 9 inches above the underside of the keel plate. The half girth of. this section: is"32 feet, making a surface of 408 square feet on one side of the vessel. The half girth is divided in three parts, 10, 7 and 15 feet, and the cen- ters of same are 5, 13 and 13.5 feet below the water line, Fig. 3. The water pressure on this section is as follows: 12.75 x 10 x 625 x 5 = 39843.75 Pak ef) 702. 52x: 13) = 72975.63 a2 fox AS. x 62,5-~% 15:22 151367.18 263786.56 i ae : 2 Pressure upon both sides 527573.12 pounds. The safe load on the longitudinal frames and two transverses amounts to 800,000 pounds. The shell plating is not included in this calculation and the result appears ' very much in favor of the Isherwood idea. Comparing Figs. 1 and 2 the Isher- wood section would appear the most natural and efficient in resisting buck- *This is the seventeenth of a series of ar- ticles on the Isherwood system of construc- tion which began in the September, 1912, is- sue of The Marine Review. The first article dealt with the general specifications of the steamer; the second with the sheet, half- breadth and body plans; the third explained the method of getting the sheer; the fourth dealt with the longitudinal and_ transverse framing; the fifth with offsets; the sixth with the shell plating; the seventh with the shell plating expansion; the eighth with the ar- rangement of plates and angles forming the ape deck; the ninth with the transverses; the tenth with bulk head construction; the eleventh with the connection of longitudinal frames to the bulkheads and transverses; the twelfth showed the interior framing between the tank top and spar deck; the thirteenth showed the amount of work that can be put together in a Great Lakes ship yard in a few hours; the fourteenth showed details of riveting in shifts of butts; the fifteenth con- sidered the subject of butt straps and laps; the sixteenth discussed Lloyds rules and their application, GaAoae Showing Certain Details of the Trans- verse and Longitudinal Systems By Robert Curr MATCH Conmine 1 a SENT ER ARCH BEAM CENTER KEaLBON MEL PLATE . 4