436 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Cylindrical Pillars of 



Safe weights, in tons of 2,000 pounds, which they can support, 

 ing columns, in which the thickness of the iron is given in 



Diameter \ 

 of Pillar 

 outside. 



Inches. 



2 



n 





4| 

 5 



Of 



6 

 6i 



63 



7J- 



74 

 7f 



8 



10 



Solid. 



0.49 

 0.75 

 1.09 

 1.53 



2.09 

 2.78 

 3.61 

 4.61 



5.80 

 7.19 



8.81 

 10.68 



12.81 

 16.17 



18.78 

 21.66 



24.81 

 28.23 

 31.95 

 35.96 



40.27 

 44.90 

 49.84 

 55.11 



60.70 

 66.64 

 72.91 

 79.53 



86.50 



93.82 



101.51 



109.55 



117.96 



§ Inch. 



i Inch. 



I Inch. 



0.40 

 0.57 

 0.79 

 1.04 



1.34 



1.68 

 2.08 

 2.52 



3.02 

 3.58 



4.20 

 4.88 



5.62 

 6.08 

 6.75 

 7.45 



8.17 



8.91 



9.69 



10.48 



11.29 

 12.13 

 12.98 

 13.85 



14.74 

 15.64 

 16.56 

 17.49 



18.44 

 19.40 

 20.37 

 21.35 

 22.34 



0.45 

 0.66 

 0.92 

 1.23 



1.59 

 2.02 

 2.52 

 3.08 



3.71 

 4.42 



5.20 

 6.06 



7.01 



7.70 

 8.57 

 9.48 



10.42 

 11.40 

 12.41 

 13.46 



14.53 

 15.63 

 16.75 

 17.90 



19.07 

 20.27 

 21.48 

 22.71 



23.97 

 25.23 



26.52 

 27.82 

 29.13 



I Inch. 



0.71 

 1.00 

 1.36 



1.78 

 2.28 

 2.86 

 3.52 



4.27 

 5.10 



6.04 



7.07 



8.20 



9.12 



10.19 



11.30 



12.46 

 13.66 

 14.91 

 16.19 



17.51 



18.87 

 20.26 

 21.68 



23.13 

 24.61 

 26.11 

 27.64 



29.19 

 30.77 

 32.36 

 33.98 

 35.61 



1.05 

 1.44 



1.91 

 2.47 

 3.12 

 3.86 



4.71 



5.66 

 6.72 

 7.90 



9.20 

 10.37 

 11.62 

 12.93 



14.29 

 15.70 



17.17 

 18.69 



20.25 

 21.86 

 23.50 

 25.19 



26.91 



28.67 

 30.46 

 32.28 



34.13 

 36.00 

 37.90 

 39.83 

 41.77 



Inch. 



1.49 



2.00 

 2.60 

 3.30 

 4.12 



5.05 

 6.10 



7.28 

 8.59 



10.03 

 11.46 



12.88 

 14.37 



15.92 

 17.54 



19.22 

 20.96 



22.76 



24.60 

 26.50 

 28.45 



30.43 

 32.46 

 34.53 

 36.63 



38.77 

 40.94 

 43.14 

 45.38 

 47.63 



1 Inch. 



2.05 

 2.68 

 3.43 

 4.30 



5.31 

 6.44 



7.72 

 9.14 



10.72 

 12.40 

 13.97 

 15.63 



17.37 

 19.18 

 21.07 

 23.02 



25.04 

 27.12 

 29.26 

 31.45 



33.70 

 35.99 

 38.33 

 40.71 



43.14 



45.60 

 48.10 

 50.63 

 53.20 



U Inch 



2.73 

 3.52 

 4.43 



5.49 

 6.70 

 8.06 

 9.58 



11.28 

 13.19 

 14.92 

 16.74 



18.65 

 20.64 

 22.72 



24.88 



27.12 

 29.42 

 31.79 

 34.23 



36.72 

 39.27 

 41.87 

 44.53 



47.23 



49.98 

 52.77 

 55.60 

 58.46 



