tu 
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vane, would always turn the fails into their proper pofition, without any 
manual operation whatever. He alfo propofes a method of furling the 
fails by means of rollers, to be worked with cranks. 
5. An improvement in the art of guaging. Signature W.—Read No- 
vember 16, 1792. 
The author points out various fources of error in the prefent pradtice 
of guaging, particularly taking the dimenfions outfide of thecafk. He 
gives a drawing and defcription of an isftrument fer taking the neceflary 
dimenfions, viz. The length, head-diameter, bung-diameter, and a 
middle diameter between the head and bung, all infide of the cafk; and 
by means of a table which he has fubjoined, fhews how to compute the 
contents of any cafk from thefe dimenfions, with the greateft eafe and 
accuracy- 
Befides the above communications, an eflay on the caufes of the tides 
has been received, but not being within the limited time, was not brought 
under confideration at the laft adjudication. 
Several other pieces have been before the Society, but as their time 
of prebation (five years) will expire before the next adjudication, in De- 
cember 1793, they are of courfe decifively unfuccefsful, and need not 
be noticed. 
Publifhed by order of the Society, 
JAMES HU'LCHINSON, 
SAMUEL MAGAW, Secretaries. 
J. WILLIAMS, Jun. 
END or THE THIRD VOLUME. 
