APPENDIX, 

 place before the ftray line was out. The line between the 

 diver and the cone fhould not be more than fifty feet, 

 that being as great a depth as it will fink to whilft the 

 ftray line is running off the reel when the fhip has much 

 way through the water. 



On the paffage out, the longeft period of my trying this 

 log between two obfervations, was from the twenty- fifth 

 to the thirtieth ; in which time the fhip had run four 

 degrees, and the reckoning by Bouguer's log was eighteen 

 miles aftern of the {hip : but as it appears that the fhip 

 on the twenty-fixth, with the wind Northerly, and 

 making barely an Eaft courfe, was found by the ob- 

 fervation to be twenty miles to the Northward of her 

 reckoning, that diftance muft be attributed to a current ; 

 therefore if that current had not taken place, Bouguer's log 

 would have been, inflead of eighteen miles aftern, two 

 miles ahead of the fhip. 



On the paffage home it was tried from the latitude of 

 eighty degrees eleven minutes to fixty-eight degrees eleven 

 minutes ; in which diftance, though the fhip was much 

 yawed from the fea being frequently upon the quarter, 

 this log was only thirty-one miles ahead of the fhip, 

 which might be owing entirely to that circumftance with- 

 out any other caufe. 



The ft ate of the common log on the paffage out, when 

 the weather was remarkably fine and water in general 

 fmooth, was, from the latitude of fixty degrees thirty- 

 feven minutes to feventy-eight degrees eight minutes, with 



7 the 



93 



