Popular science monthly . canwork was turned out. It was not long, however,before the Government be-gan to wonder what wasbecoming of its gold officials knew the peoplewere not hoarding gold, so a quietinvestigation took place. It was thendiscovered that the makers of goldjewelry w-ere to blame. Having foundthe cause, it was not difficult for theofficials to find a cure. They did itby peppering the coins withiridium. Resembling blackemery in the crude state,iridium requires a heatof 3,542 degrees Fah-renheit to melt , on the otherhand, can be melt-ed at 1,913 degreesFahrenhei
Popular science monthly . canwork was turned out. It was not long, however,before the Government be-gan to wonder what wasbecoming of its gold officials knew the peoplewere not hoarding gold, so a quietinvestigation took place. It was thendiscovered that the makers of goldjewelry w-ere to blame. Having foundthe cause, it was not difficult for theofficials to find a cure. They did itby peppering the coins withiridium. Resembling blackemery in the crude state,iridium requires a heatof 3,542 degrees Fah-renheit to melt , on the otherhand, can be melt-ed at 1,913 degreesFahrenheit. It iseasy to see, then,how the unsuspect-ing jeweler, meltingup his gold piecesat the temperaturerequired, got a largenumber of unnielt-ed specks of iridiumin his metal whenit cooled. You can imaginehis dismay whenhis analysis anddeductions re-vealed that he hadbeen trapped. Quebecs Disastrous Bridge How the principle of a divers spring board is ap-plied in the building of the biggest cantilever bridge Bv C. E. Dravc r. One of the cantilever arm-compression diagonals being placed in position. Like the opera-tions of an army in the field, the work of erection has a dash of danger and romance. Asthe success of the army in action is due to the output and character of the shops behindthe lines, so the speed of erection of a structure is due to the excellence of the shop work TniC new Quebec cantikner bridgeranks among tlie most importantand lirilliant of all boldness of a great general in warpales by the side of the courage of itsbuilders, wiio had little precedent tofollow in some of its vital and mostdifficult features of design and , they liad to jjrocced in theshadow of the giiastl\ catastrophe of itspredecessor which crumpled and fell,carrying to deatli nearl\- a hundred tliis siiadow was not an imagin-ary one is cviticnced by the recentdisaster when the suspended span fellfrom fifteen feel above the water whilebeing hoisted tf) pos
Size: 1896px × 1318px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
