by the Log, or any other Method hitherto ujed 
for that (purpofe j together with federal Tejlimo - 
jiiahy Jetting forth the Ufefulnefs of this Inden- 
tion. (By Mr. Henry de Saumarez of the Ifland 
of Guernfey. 
i J_ ' -! 1 — 
ERRATUM. 
35>o. p. l2t f or ManeI r • Maud. 
