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ee Oe -- se 'The connection of girders to buldhead in the drawing shows the number of rivets necessary to fasten ends. X83 shows the rivets through the bulkhead floor, which are under tension when the vessel is supported at the ends The girders through line of rivet holes will stand a tensil strain of 180 ions. The tensil strain of a %-inch rivet being 10 tons, eighteen rivets are required. to connect the girders to the bulkhead. X4 shows rivets through the girder which have a double shear and are equal to 16.5 tons each. Eleven of these rivets are equal io eighteen rivets of single shear = ~ Connect son of -- ; eee ~ Sipe STRINGER -- . : u 0 To ButkHEAD-- : 2° z oes ' ° o}o N 9° _ 42) ° 2 ° oO © ° 8 @ 0 -- meeee ai Is) ° ° | Jo 22° 90 o I] an o joolo 0000000) | oo 3000000 of 6 ---- 2 0 Ill 0 0 0 © 59 oO 9 Lo) ais 2 > | 2 Breeeer _ oll hy 0 9 b e a |B © WSo¢ e| S706 é v a o| Ste ee TRINCER a -- a Q a 2 Ee oy Sere ° =e 2 e oC! To te Q 2 MARGIN | 0 ofl s Plate | °| ,. a ry o BIN ° 2 4 °o ° y ie C eliiv Conneerion of @iroere he fells Ta BelRHEAOS -- oT ° Q 2 FLvoR BAR \ Pelee ° RH S| Aerie 0 ole © iQiic| [| fencee fe o-|f} © mantle ° V2 oae! olfllo VEPs Ty|i| o Lt ; Look cE eli] ° To Ey Sil] © °o10 olfio ne apy eo] B 10 elmo te | 2 oe . a 1° ¥ TANK Uti] ° 2 oT e ° a ° Tor | M2 5 o 2s Cle oe ie ' . o ° 3 Q a ° peta) XT --o} 6 y eo ; > ° } ConTiN uous - @ loll = "CIR QER - | ° : All elspok | | ° Swale ° : . » Tew a : | CFE ~ LIN, o --. es. °o 5 ST Weft || Tanase -- ° 1 ° il] & ° of] rs AR 2 ° a 1° eS | ° 5 if ° ° Sl Aa eet -- -- bh ee \° | | 6 Ms it r o s | a Riper je TIN! | Keabfe : ay PLare| | . jm ols LINE BecwevEpo cenra|e |irsPs ate . KxRL SON " QaNTRR RERLEON --. under tension. 'The connection of side stringers shows the number of rivets needed to compensate for stopping plates at the bulkhead. The side stringer at the weakest part would stand a tensile strain of 200 tons. X shows twenty- one rivets which are equal in strength to ten tons each under tension, which is 10 tons greater than the tensile strength of plate and angles. X' shows bracket plate fitted on the inside of the side stringer, which is connected to the stringer and bulkhead. The complement of rivets could not be gotten in satisfactorily without this bracket, as for instance X2 shows the stringer connected to the MARINE REVIEW. | . bulkhead with six rivets double shear and two single shear in the clip at X. If any more rivet holes were punched through stringer at the bulkhead X2, it would reduce the area of the section so much that it would not stand the strain of the weakest section. X/ shows twelve single shear, #-inch rivets equalling _ 100.8 tons; X2 shows six double shear, equalling 99 tons; X shows two single shear, equalling 16.8 tons, or atotal equalling 216.6 tons. These calculations are on condition that the rivet points are properly formed and plates and angles closely fitted to the bulkhead, leaving no undue strain on the rivets. Any carelessness in the workmanship of connecting longitudinals to bulkheads is damaging to the vessel, as this weak section can only be overcome by good work and the full complement of rivets. Favoring Baker's Submarine Boat. Special Correspondence to the MARINE REVIEW. Wasuincton, D. C., July 6.--The special naval board, te which was re- ferred the proposals recently received by the department for the construction of a submarine boat for the use of the navy, has completed its work and sub- mitted its report to Secretary Herbert, The board found that only two of the designs submitted are practicable and recommends that one of these be accepted. All of the bids came well within the $200,000 appropriation for the construe- tion of a suilable boat, and it is thought that the offer of Geo. C, Baker to build the boat for $135,000 will be accepted and the craft completed as soon as possible, the remainder of the money to be expended in testing her efficiency as a submarine weapon of warfare. Foreign governments are watching with interest the action of the department in this matter. Secretary Herbert is inviting bids for the contracts for building the three -- new gunboats authorized by the last Congress, and for supplying gun forgings for these ships and several others that are now building, but whose armaments are not yet commenced. Between $2,000,000 and $3,000,000 will be involved in these contracts. For the gunboats there will probably be the liveliest com- petition experienced since the beginning of work on the new navy. A num- ber of small firms now engaged in building merchant ships only will probably enter the competition. The Cramps, the Union Iron Works, and the Midvale Steel Works, the Bath Iron Works, and the Columbian Iron Works will all doubtless be strong rivals for the new contracts, The contract for armament calls for sixty-four sets of gun forgings. The Bethlehem Iron Works and the Midvale Steel Works will doubtless, be the only competitors, as they are the only firms having facilities for turning out gun steel. Iron Mining. VALUE OF LEADING STOCKS. Quoted by Chas. H. Potter & Co., No. 104 Superior St. Cleveland, O. Stocks. | 'Par Value. Bid. Asked. Cleveland--Cliffs Iron Company.............. $100 00 -- Pease aps aspen Champion Iron Company............0+. aaaneee ZS OO ieee sues coe erat tee Chandler Iron Company..........csecseeeereere 25 OOF 1G Mie -cke nt 40 00 Jackson Iron Company.......... Pra setnsees canes 2 OO sme umes 75 00 Lake Superior Iron Company.........:.see00 D5 OOr et eten seo encn a tereenee Minnesota Iron Company..............- basedeas LOOPOO SUi fa) avec tase - 60 00 Pittsburgh & Lake Angeline Iron Co... 25 OO --seveneees steven eee Republic Iron Company......--.seeeeseeesereee D5 OO oar tip tdaasten 9 25 NEV WME WOKG l= 5-555 50R oce coorebiennonean Gee i. Saekee oe isas ts 5 1OCy iit yeh et Eo eee Section Thirty-three.......... esa amgegwinn tepeieace Bo OO 8 oo sy anpiding eigen Girne BHO MSKAVONTS \AcaogHooDoDosage -bab0bodsCeRaoSdeonosTCaN 2S CO 9 ee psnodo0s 2 50 Trot Belt. Passe ohne ak «cies eis dotees cleaie vole te si platelets 251005 "iia teres 275 SAITO LArcaecedccescencecdeacercars steetnsabeesats PISMO ROSS 7 00 Owners of the fee of the Dunn mine, in the Crystal Falls district, announce that they will permit grass to grow knee deep over the location before they will reduce the present royalty of 4o cents per ton. Ferdinand Schlesinger, the lessee, shows no disposition to interfere with the growth of the grass at present, and it would not be surprising if he permitted the owners to go to grass with the mine. Serve them right, too.--E xchange. Notwithstanding the great 'general fall off in iron are ship- ments from Lake Superior mines, the movement from 'wo Har- bors on June 27 was but about 20,000 below that of last year. The aggregate was 277,091 gross tons, divided among the differ- . ent wreeas follows: Chandler 132,686, Minnesota 128,985, Can- tion 8,284 and Cincinnati 7,136. From Ashland, the Wisconsin Central road had moved on the same date 217,580 tons and the Lake Shore 142,036 tons, a total of 359,616 tons, or 211,463 tons lees than on a corresponding date last year. Amounts shipped through Ashland by the defferent Gogebic range mines are: Ashland 26,465 tons, Aurora 60,233, Colby No. 2 5,129, Tilden 30,929, Iron Belt 2,725, Montreal, south vein 1,347, Montreal, north vein 12,205, Brotherton 7,619, Comet 5,035, Carey, west 10,866, Kast Norrie 21,621, Eureka.9,656, Newport 19,576, Nor- rie 77, 884, Pabst 52,880, Sunday Lake 12,219. No master trading to Lake Superior shoul be without a chart of the north shore. We have them for sale at $1 each. on ee ce i ga pa oe a eg manta mE RC aT IES