( 4 l 9 ) 
noted ProfelTor of the Mathematicks in the College 
<£ of Jefuits there. He was all Surprize at the regu- 
cc lar Motion of the Machine under Water, and more 
u that it fhould fo nicely determine the Diftance 
Ci fail’d of any Ship or Boat. 1 lhould fwell my Let- 
<c ter to too great a Bulk, (hould 1 repeat theConver- 
<£ fation I had with this Jefuit, who importun’d me 
c ‘ much to fee the In fide of the Clock-Work, ofFer- 
“ ing me what 1 pleas’d for a Sight of it. In a word, 
C£ I was deaf to him, ani many other Gentlemen of 
££ the Town, who crouded to me every Day on the 
t£ fame Account, and who were all greatly pleafed 
u with the Invention. 
££ The Machine made by my Dire&ions at Toulon , 
« I us’d in my Way home, and found it to anfwer 
££ very well in the Ocean \ from whence arifes this 
t£ Remark, which fufticiently (hews the Ufefulnefs of 
« your Invention, viz. That even rough ones, made 
* by a meer Cobler of a Smith, and turn’d by the 
“ Dire&ions of a fhort Memory , which I dare not 
££ truft in many Things, are capable of anfwering the 
C£ End for which you invented them. 
“ It muff be noted, that though I allow one feventh 
t£ of the Ship’s Diftance for her Deviation from her 
££ Courfe, yet fome Ships are fo built, that they will 
C£ fteer much truer, and others worfe than ours did * 
*• and in this Cafe the Marine -Surveyor fhews its 
< £ Worth ; for if two Ships are in Company, the one 
< fleering well, the other ill, the Latter fhall have 
“ more Miles than the Former on comparing their 
c£ Run, although they fet out from the fame Port, and 
< c never part Company. 
I fhould be wanting to my fell, if I did not produce 
the moft convincing Proof of the Ufefulnefs of this 
new Invention ; I fhall therefore add to the foregoing 
O o o 2 Tefti- 
