( JO ) 
then Dutch Ambaffadors at our Court, to' compli- 
ment his Majefty on his Accellion to the Throne. 
My Machine being fixed at the Stern of this Veflel, 
we kept her Run both by it and the Lag. On the 
niceft Calculation, in our Pahage over^ the Differ- 
ence between us was x Miles and 2640 Feet : At 
this I was in no wife furprifedj for as^I knew the 
Log to be very erroneous, and 1 undertook to correft 
the Errors of it by. my Inftrument ( in the Truth of 
which I might then be too forward, as too many are 
on fuch Occafions ) I was affured we could not a- 
gree ; and therefore I charged the Difference accord- 
ingly. 
Among the confiderable Company on board the 
Yacht, we had a curious Gentleman, Captain Zj/;;- 
jlagefy Commander of one of the Dutch Men of 
War, who feemed not a little plea fed with my Con- 
trivance ; and no fooner did he land in Holland., but 
he fpoke of. it to fome Gentlemen of the higheft 
Rank there, whofe Curiofity induced them to defire 
to fee an Experiment of this Invention : Accordingly 
I was fent for to the Haguey and on the Canal there,, 
before Baron Hopy Baron Wajj'enaar y Admiral 
Somelfdyky Mr, s'Gravefand (Profeffor of the Ma-’ 
thematicks in the Univerfity of Leyden ) Captain Zj///- 
flageryifc, we run a certain Diftance in fwift and flow 
Motion, in order to fee if the Inftrument would have 
an equal Number of Revolutions therein. In run- 
ning up, it revolv’d 2300 Times,, and in coming 
down 2060. Here then was enough to convince me, 
that Dr. DefagulierSy and Mr.. Motyneuxy had judg- 
ed truly of the Fork, and more efpecially fince the 
learned Mr. s^Gravefand joined in Opinion with 
3 them j 
