TIME SYSTEM 

 OF WORK 



Immediately on receipt of the architect's plans 

 and >pecifications. a time-table was made- up giving 

 the dates for the completion of the 

 various stages of the work. This 

 time-table covered all stages of tin- 

 work from the making of the drawings to the final 

 completion of the steel work. 



A large force of skilled engineers and draughts- 

 men were employed for several months making tin- 

 working ami detail drawings; a large part of tin- 

 work was very complicated and the detail drawings 

 had to be executed with unusual care and engineering 

 skill. The accuracy of the drawings and the shop 

 work was evidenced by the fact that when the work 

 was erected the various parts went together perfectly, 

 thereby saving a great deal of time and expense in the 

 field, which is a very important matter. 



The first shipment of material from the shops was 

 made Oct., 1906, for the column anchorages, then 

 the material was delivered for the grillages support- 

 ing the columns on the concrete piers, after which the 

 heavy cast steel bases were delivered. 



Unusually careful preparations were made for 

 the erection of the framework for this great build- 

 ing. Every tool and appliance nec- 

 essary for tlie setting of the work was 

 specially selected; the men chosen 

 to take charge of the work en- 

 gaged the most competent and skilled lionsesmiths 

 to be had, and every precaution was taken at the 

 very start so as to carry on the work of erection 

 in a faultless manner. 



Shipments were made from tin- 

 works on lighters, two complete 

 tiers bring shipped at a time, and 

 the erection proceeded at the rate of one tier every 

 two days. 



SPECIAL 

 TOOLS AND 

 APPLIANCES 



DELIVERY OF 

 MATERIAL 



SHJNAI.1V; T<> IIOISTIV; KVJINK 



THJ1ITF.NIVJ A m-'.UUK K (JUY 



At the 4()th tier the heavy steel ribs of the dome 

 had to be erected. The setting of tlioe ribs, which 

 were in two sections, required extreme care on ac- 

 count of the weight of the sections, the great height 

 at which the men were working and the complicated 

 nature of the construction. 



(ireat care was necessary to keep the steel work 

 plumb as the work progressed. The plumbing was 

 done with plumb bobs to exact lines, located on each 

 floor. Wire- rope guys with turn-buckles were used 

 to pull the columns plumb; these guys were left in 

 place until the connections were all riveted. After 

 the erection of the framework was entirely com- 

 pleted the greatest variation in plumbing was found 

 to be f of an inch. This was in a height of .>7~> feet. 



The field holes connecting the Tower bracing 

 were punched j jj-inch diameter and reamed to ff-ineh 

 diameter in the field; the reaming 

 was done with air reamers. 



About 237,000 field rivets were 

 driven with 12 pneumatic ham- 

 mers, the air being supplied by 2 compressors set 

 on the ground floor, and piped up to the hammers 

 as the work progressed. As many as 1,.'500 rivets 

 were driven by one gang in a single day, which is 

 a record for this class of work. The rivets were 

 heated in oil furnaces supplied with pneumatic blast 

 from the air compressors. 



Approximately 7.000 tons of steel work were used 

 in the Millikcn contract for their part of the con- 

 struction of the building. A temporary electric pas- 

 senger elevator was installed by mutual arrangement 

 of the contractors engaged on the work to take the 

 men up and down as the work advanced. By this 

 arrangement time and labor were saved and the use 

 of stairs and ladders obviated in going up and down 

 in the building. 

 | 



AIR REAMING 

 OF FIELD 

 HOLES 



