Octagonal Shafts

Speakí ng of broken shafts, a couresponder .t suggests that sliaf ts mig'ht be made o ctagonal and liexagomxl instraci of ror oid, outsido of hearings, aml a numtj of slèeves in half sections ajuld hecatrried to he applied to cover any breaii and. holted together, wbich v? oiild mafce a strong joint. The idea í;eems