ABSTRACT
N~=r25~2¢[Jr,r2(p,cos¢- p~sin¢)sin¢d¢+CJ(3) N8isthengivenbyequation(2).TheconstantofintegrationisgivenbytheknownvalueofN~at theopentopringatanyintermediatestageofconstructionorattheuppermostringofthecentraleye oncompletionofconstruction.Thus,atanyintermediatestageofconstruction,N~=0for¢=¢., where¢.isthevalueof¢atthethenuppermostring.Similarlyoncompletionofthedometothe centraleyebutbeforeconstructionofthelantern,N~=0for¢=¢.,where¢.isthevalueof¢at theeye;and,oncompletionofthelantern,N4>=-Pjsin¢.,wherePistheweightperunitlength (measuredaroundtheeye)ofthelantern.
