514 Prof. A. H. Gibson on the Variation of 



Semes A. — 1400 revs, per minute. 



Temperature ° F. 



Resisting moment 1 

 (foot lbs.) J 



Ratio to moment 1 

 at65°F J 



65. 



72. 



74. 



80. 



95. 



100. 



109. 



113. i 128. 



140. 



3-279 

 1-000 



3-203 

 0-977 



3194 

 0-973 



3-117 

 0-950 



3002 

 0-915 



2-986 

 0-910 



2-920 

 0-890 



2-894 



0-883 



2-803 

 0-855 



2-701 

 0825 



Series B 



.—1175 



revs, per minute. 







Temperature ° F 



65. 



78. 



98. 



104. 



115. 



133. 



159. 



Moment (foot lbs.) 



Ratio to moment 1 

 at65°F j 



2-480 

 1-00 



2-394 

 0-965 



2-249 

 0-908 



2-257 

 0-910 



2-175 

 0-877 



2-105 

 0-850 



2010 

 0-810 



Series C 



— 1050 revs, per minute. 





Temperature ° F 



60. 



76-5. 



100. 



132-5. 







6-460 

 1003 



6-377 

 0-989 



6215 

 0963 



6138 

 0-950 



Ratio to moment at 65° F 





In addition to these a number of results of experiments by 

 Dr. W. C. Unwin on a disk having n=l*85 are available *. 

 These are as follows: — 



Temperature °F 



41-2. 



530. 



70-4. 



130-5. 





Resistance 



0-1215 



0-1149 



01112 



0-1003 





For the sake of comparison the whole of the foregoing 

 results have been plotted in the diagram against the curves 

 representing the relationship 



Resistance at *° F. = Resistance at 65° F.xf^- j 2 "". (lV"i 



CA665J <><»65j 



for corresponding values of n. From these it appears that 

 * Minutes of Proc. Inst. C. E. vol. liii. p. 221. 



