Show A A aann MAMMOTH 0 o oriU of Mechanical Science vow flow the groat creat building for manufactures and liberal arts ot at the worlds fair was planned A Dion monitor star derrick it t J ii in its present stage of construction that the mammoth building for tho the manufactures and liberal arts at tho the worlds fair is most curious and interesting says saya harpers weekly they are now at work on the big derrick or traveler asit is called and the dimen of this engine are arc suggestive of tho the tremendous proportions the building will assume as it nears completion the great eads bridge at st louis is a romar remarkable liable structure turo and one would fancy that a building containing ta more iron and steel than that embraced in its mighty arches must bo be a rare building indeed in the manufactures fac tures building will be used tons more of metal than the amount used b by y mr eads engineers now new yorkers know what brook ii I 1 i bridge looks like with tile the metal to be used in the liberal arte art building two such bridges could be built and there would remain as much a as 11 1 1 1 tons unused to be more anor 5 exact upwards of pounds of steel and iron will be consumed by tho the constructionists in the work of putting the liberal arts hall together the plans for this tile most extensive building ever attempted by man were prepared by mr george B post of ne new w y york ork the trusses that will support the roof are arc the largest in the world there will bo be a clear span of feet from pillar to pillar when mien the now new yorker stated that a span of this on would be used architects 1 ts and builders generally laughed at t thelca and said that this was ideal cons construction tructien but the enterprise was not submitted solely to builders of houses it was a point that was not all included in the studies of archi architecture it more nearly approaches bridge en cu gin gingering cering this is true of more than one building planned for the columbian exposition the bridge engineers were consulted made their calculations looked closed their eyes as if in deep thought and then pronounced it can acci be done but it will cost a great fortune in dollars mr post was vindicated and tho the worlds fair treasurer undertook to do the rest ff the he contracts were lot let to a pittsburgh company and now they are demonstrating a the accuracy of tho the mathematics by literally doing the work but there was another problem and not a small one to bo solved before tho iron ron and steel wore made ready given the he plans and tho material how could this tons of metal bo be lifted into position thero there are arc SO 20 main trusses truss cs each ach weighing tons and these aro to form the b bases ases for tho the roof spans to 0 lift a massof mass of material weighing tons ns and to handle it with tho precision and accuracy necessary for tho niceties of mr posts plans require no common enginery and no common enginery nery is brought into play here hem it awas as a month ago that the builders boan bean the dorkof work of constructing the engine aich was to carry these immerso masses asca of metal 1 I as easily as an athlete swings a dumbbell dumb bell boll it was now almont dished a derrick feet amt in heights height nd SOS SM feat aci t in laneth it is built with lour our uprights at tho the corners comers that aro jointed at sout sections ions of 40 feet by heavy ross roos beams making the skeleton for the he stays are arc used as na ropes of steel that ire re strung diagonally then there are arc V that being bolted and raised to tho the cross beams insure tho of tho the structure E the tra traveler voler rests on a foundation stable and as aa soled as may bo be A trip rip of the great floor was torn up and les in throe rows rowa were driven in along ho 0 lino line of the track tho the derrick 3 to follow caps of timber 12 isa indies inches aare on which aze placed juiced pound I 1 rails moko malce truck track purchase will i had in tho the great cranes that will bo be aled 9 ed on tho to top 11 of tho the traveler ho he heaviest tackle obtainable will bo be ased sed in the working of these cranes A tio nary en kano will be used to move derrick along the track now that this great derrick Is ready tia expected emt the building itself ill crow ravi div in this caw tha th prop lor for the te v work Is almost as great an finder taking the work |