1835.] 



Table of the strength of Iron bolts. 



225 



X. — Table shewing the Weight or Pressure ivhich a cylindrical wrought- 

 iron Bolt will sustain when supported at the ends, and bonded in the 

 middle of its Length. By Captain J. Thomson, Engineers. 



Leng. In. 



of j 

 bearg. I £ 



Wt.in 

 Tons. 



2 



4 

 6 

 8 



12 



16 



20 



24 



28 



32 



40 



48 



56 



64 



72 



80 



88 



96 

 104 

 112 

 120 

 128 



Dm, 

 Ins. 



•57 



•72 



1- * 



1-33 



2" 



2-66 

 3*33 



In. 



Dm. 

 Ins. 



•72 



•9 

 1-03 

 1-14 

 1-3 

 T43 

 1*66 

 2- 



2 '33 

 2-66 

 3*33 

 4* 



In. 



In. 

 1 



Dm. 

 Ins. 



1-82 



1-03 



1-18 



1'3 



1-49 



1-64 



1-77 



1-38 



1*98 



2-07 



2'23 



2-*5 



3*11 



3-55 



4. 



Dm. 

 In. 



•9 



1-14 

 1-3 

 1'43 

 1-64 

 1-81 

 1-95 

 2-07 

 2-18 

 2'28 

 2-46 

 2.61 

 2-75 

 2-87 

 3-* 

 3-33 

 3-66 

 4. 



Ins. 

 If 



Ins. 

 If 



Dm. Dm 

 Ins. Ins. 



•97 

 1-23 

 1*4 



1-54 

 1-27 

 1-95 

 2-1 



23 



35 



45 



64 



81 



96 



09 



3-21 



3-33 



3*44 



3-54 



3*63 



3-72 



4 .r 



l 4 -3 



1-03 



1'3 



1-49 



1-64 



1-88 



2-07 



2-23 



2-37 



2-49 



2-61 



2-81 



2*98 



3-14 



3-28 



3*42 



3-54 



3-65 



3-76 



3-86 



3-96 



4-05 



4*14 



Ins. Ins. 



I 



Dm.! Dm. 



Ins. 



Ins. 



1-09 



1-14 



1-37 



1-44 



1-57 



1-64 



1-75 



1*8 



1*98 



2'06 



2-18 



2-28 



2-35 



2'46 



2'49 



2-61 



2-63 



2-75 



2-75 



2-87 



2-96 



3*09 



3'15 



3-29 



3-31 



3-46 



3*46 



3*62 



3'60 



3-76 



3*73 



3*9 



3*85 



4*02 



3-96 



4*14 



4-07 



4'25 



4-17 



4-36 



4-26 



4-46 



4-36 



4-56 



Ins. 

 3 



Dm. 



Ins. 



Ins. 



4 



Dm. 



Ins. 



Ins. 

 6 



Ins. 



8 



Dm 

 Ins 



1-3 



1-64 



1-88 



2*07 



2-37 



2-61 



2-81 



2*98 



3'15 



3-29 



3*54 



3-76 



3-96 



4-14 



4-30 



4*46 



4-60 



4-74 



4-87 



4*99 



5-11 



5'21 



11-44 

 1-8 

 2-06 

 2.28 

 2-6 

 2-86 

 3-1 

 3-28 

 3-46 

 3'62 

 3-9 

 4'14 

 4*36 

 4*56 

 474 



1*64 



2-06 



2-36 



2-6 



2*98 



3-28 



3*54 



3-76 



3'96 



4-14 



4-46 



4"74 



4-98 



5 22 



5-42 



5-62 



5*8 



o'96 



6-14 



6-28 



6*44 



6-56 



Dm. 

 Ins. 



1-8 



2*28 



2*6 



2-86 



3*28 



3-62 



3*90 



4*14 



4-36 



4-56 



4-92 



5*22 



5*50 



5-74 



5-95 



6-18 



6-38 



6-58 



6*74 



6'92 



708 



7.24 



Ins. 



10 



D-n. 



InSk 



12 



Dm. 



Ins. Ins. 



1'95 

 2-46 

 2-81 

 3-09 

 3-54 

 3-90 

 4-20 

 4*46 

 4-70 

 4-91 

 5-29 

 5-62 

 5-92 

 6-19 

 6-43 

 6-67 

 6-88 

 7*08 

 7-27 

 7-45 

 7'63 

 7'8 



2-0S 



2-6 



2*98 



3*28 



3.7 



4-14 



4-46 



4-74 



4-98 



5*22 



5*62 



5-96 



6-28 



6-56 



6*84 



7'08 



7*30 



7*52 



7-72 



7-92 



8-10 



8-28 



Observations on the foregoing Table. 

 There are two ways in which the bolt may be broken, either bv a 

 cross strain, or by detrusion, which is the pulling out the part of the 

 bolt from between the points of support : besides these two ways in 

 which the fastening may be broken, the bolt may crush and cut away 

 the eye of the link which presses upon it. 

 J If w= weight or pressure in tons, 



£=length of the bolt between the points of support in inches, 

 d= diameter of the bolt in inches, then rf=(.37 w l)$ to 



support a cross strain ; but when I becomes less than 



(— ) 



x 267 ' 



the 



But 



bolt will be liable to detrusion, to avoid which, d—(.08 w) 

 detrusion can never take place when both the bolt and the link are 

 formed of iron, or the same metal, because when / becomes less than 



( — — "T - r the link may be cut by the bolt ; to obviate which, the 



value of d should be 



w 

 24/. 



This last equation supersedes the first 



t These rules are taken from Tredgold, the arbitrary quantities assumed by 

 him being corrected by a comparison made, and a mean, taken from the best au- 

 thorities. 



