98 



APPENDIX. 

 Smooth water and moderate weather, when it is neceflary 

 to ftand on one courfe for any particular diftance, efpe- 

 cially in the night, or a fog, as it meafures exadlly the 

 diftance run. It will alfo be very ufeful in finding the 

 trim of a fhip when alone ; as well as in furveying a coaft 

 in a fingle fhip, or in meafuring diftances in a boat be- 

 tween headlands or flioals, when a bafe is not otherwife to 

 be obtained ; both which it will do with the greateft ac- 

 curacy in finooth water, with a large wind, and no tide 

 or current. But notwithftanding thefe advantages, which 

 will make it very ufeful and worth having, I doubt much 

 whether it might ever be fubftituted entirely in the room 

 of the common log. Machines eafily repaired or replaced 

 have advantages at fea, which fhould not lightly be given 

 up for others more lpecious» 



Observations 



