366 MISCELLANEOUS STRUCTURES 



adjusted on a hot day. To prevent secondary strains in the half ring 

 to which the radial trusses are connected at their tops, there is i-i6-inch 

 clearance in all the pin holes. There is also clearance between the pin 

 plates, so that the trusses and the ring can slide a little sideways on 

 their pins. The lines of the arch trusses were laid out full size and the 

 principal points checked by independent measurements in the template 

 shop, and the work was accurately assembled. In order to avoid the 

 handling of large, heavy pieces before the drill press, the foot of the 

 arch, through which the pin hole was bored, was made separately and 

 afterward riveted on. 



The total weight of the iron in the entire structure was 1,905,000 

 pounds, as follows: Main arches, 64,000 pounds, each; radial arches 

 21,000 pounds, each; purlins between main trusses 1,450 pounds, each; 

 main floor stringers 810 pounds, each; balcony floor stringers, 280 

 pounds, each; cast shoes 3,000 pounds, each. There were 4,188 days 

 labor spent on the work in the shop and 3,550 days labor during erec- 

 tion, the average number of men in the erecting force being about 50. 

 The stress diagrams and detail plans of the steel frame were made un- 

 der the supervision of Mr. Stern, in the office of the Koken Iron Works, 

 who were contractors for the ironwork, and were submitted for approv- 

 al to the consulting engineer, Mr. Julius Baier, Assoc. M. Am. Soc. 

 C. E. Mr. C. K. Ramsey was the architect of the Coliseum, and Mr. 

 L. H. Sullivan was the consulting architect. Mr. A. H. Zeller was 

 consulting engineer for the Board of Public Improvements ; Mr. J. D. 

 McKee, C. E., was shop inspector, and the Hill-O'Meara Construction 

 Company was the general contractor. 



