Tniimitiim StiiditH 



57 



run ill lufiial times. Thus a suitable name would have been 'hoclograni' had 

 not something like that word been alifudy appropriated in anothfr and 

 rather unfitting sense by Sir William Hauiilton. Cialtun in his third paper, 

 publislied in the lioi/al Society Proceediru/s', and entitled: "On tlie Kni- 

 ployinent of Meteorological Statistics in determining the l)est couixe for a 



8 lldiii'lv Isodii- CiirveH in .Si|iiiiri' 3. J«uiii.iry 

 TliriliiTclKin iiihI aiiumiil «C tlii- Curn-iil ia shrwii. ami i»» i-flW-t m infliiilril in Uic Uod. 



fiift'cun* »•■• » »**« 



t*' 



If 



IMAN 4M- 





I *' itf &r cum wo*^ M.TsTw, 



KS'RAT[0«M. 

 / 



\ 



MtTCVRr 9IRT N.nt<^ 







■Mtrcvit* omr N.n % 



/ \ 



ItCft'CURT Dill? N.S»Tw 



/ \ 



28" 



JIMT CUKT Dt«? « W« 



r.'un aj» 



«ltt M*' Dint •.!•**. 

 ■PUTt IN. 



•vuitMa 



•(•• on M» t iim. 



K Mil 011^ 





ii^'MTto^a 



(!) 



\ 



'Jit»T cunt [»■• n.«»*«r. 



(9:: 



2«* 



KSrcuR* SIR' 



llR*N.>l.lb 



(^.. 



MS' CURT M«? N.7<T«' 

 »«IUTtft*M. 



2rt"w. 



NotC! KCST CUI! . KCSUIUNT cintum. 



Speaimen of Oalton's Isodio Carres from Minutes of Meteorological Council, 1873. 



ship whose sailing qualities are known," terms these hodograras "isochronous 

 curves" or simply "isochrones." The discussion of the construction of iso- 

 chrones, if somewhat fuller, follows here the lines of that in the Meteorological 

 Council Minutes. A new feature is the description of a somewhat elaborate 



' V"ol. XXI, pp. •J63-74, April IS".}. 



p o n 



