ss 



RADII OF WHEELS. 



Table of the 



















radii of wheels. 



No. 



Radius. 





No. 



Radius. 





No. 



Radius. 





241 



76,715 



261 



83,081 



281 



89,447 





242 



77,033 





262 



83,399 





282 



89,765 





243 



77,351 





263 



83,717 





2^3 



90,084 





244 



77,670 





264 



84,036 





284 



90,402 





24,5 



77,988 





265 



84,354 





285 



90,720 





246 



78,306 





266 



84,673 





286 



91,038 





247 



78,625 





267 



84,991 





287 



91,357 





248 



78,943 





268 



85,309 





288 



91,675 





249 



79,261 





269 



85,627 





289 



91,993 





250 



79,580 





270 



85,946 





290 



92,312 





2.51 



79,898 





27/ 



86,264 





291 



92,630 





2j2 



80,216 





272 



86,582 





292 



92,948 





253 



80,534 





273 



86,900 





293 



93,267 





254 



80,853 





274 



87,219 





294 



93,585 





255 



81,171 





275 



87,537 





2^5 



93,903 





256 



81,489 





276 



87,855 





296 



94,222 





257 



81,808 





277 



88,174 





297 



94,540 





258 



82,126 





278 



88,492 





298 



94,858 





259 



82,444 





279 



88,810 





299 



95,177 





260 



82,763 





280 



89,129 





300 



95,495 



N. B. When the pitch is different from two inches, the 

 radius of a wheel of any number of teeth, from 10 to 300 may 

 be found from this table, by the Rule of Three ; for as two 

 inches (the pitch in the table) is to any radius in the table, fo 

 is any given pitch to the radius required. 



For Example ; let it be required to find the radius of a wheel 

 of 100 teeth, when the pitch is 1| inches. The radius of a 

 wheel of 100 teeth is, in the table, 31,836 inches. Accord- 

 ingly we have 2 : 31,836 : : 1,25, to the number of inches in 

 the radius required; which will be found 19,897 as by the 

 Operation annexed. 



2 : 31,836 : : 1,25 

 1,25 



159180 

 63672 

 31836 



2) 39,79500 



19,8975 



VII. Account 



