( 55 9 ) 
, r ■ ■ _ or ; : ■; r 
Chafes Micrometro dimen fa . 
Dig. i 
x 
3 
4 
4 33' 
H. / // 
* 5* xx 30 
• 30 50 
37 54 
44 30 
47 30 
Solis Semidiameter faspius micrometro dimenfa exa&e 
implebat 16 1 o". 
In difco Solari macula a quatuor notatis in immerfione 
diverfae plures apparuere ; Sed e* exiliores, quam 
ut immerfio lllarumquoqueper vapores Phcebiim ob- 
fcurantes difcerni poffet. 
VI. Jn Account of a Machine for meafuring any 
Depth in the Sea, with great Expedition and cer- 
tainty ; Jhcum to the (Royal Society, hy J. T. Def- 
aguliers, L. L. D. and R. S. S. contriv'd hy the 
Rev. Mr. Stephen Hales, F. R. S. and Himfelf. 
T Here have been feveral Machines contriv’d for 
meafuring the different Depths of the Sea, efpe- 
cially fuch as could not be determined by the Lead and 
Line ; but as thofe Machines confifted of two Bodies 
(the one ftecifically lighter, and the other fpecifically 
heavier than Water) fo joined together, that as foon 
as the heavy one came to the Bottom, the lighter Ihould 
get loofe from it, and emerge ; and the Depth was to 
be eftimated by the Time of the Fall of the compound 
Body 
