f 55 ) 
fition, even though the Ship or VefTel to which it is 
faftened be at Anchor, or under Sail. H B is a Rope, 
of a convenient Length, fixed to a Screw or Worm 
at the Point B, which goes about 6 Inches into an 
Iron .Pipe, of which BI is the Length: Through this 
Pipe an Iron Spindle pafles into the aforefaid Screw 
or Worm to which the Dial C is fixed : as foon 
then as the VefTel moves, the Fork plays in an Hori- 
zontal Pofition, which moving the Spindle within 
the Iron Pipe, the Motion is thereby communicated 
to the Dial, which is fitted to ftrike to the Miles or 
Leagues the VefTel runs • and let the VefTel move 
fwift or flow, the PaUets A and F are equally af- 
feded, and confequently muft meaTure the Diflancc 
failed to a greater Exadnefs than the Iron Fork is 
capable of in the Manner I have defcribed it in the 
PhiloJ})pJolc£iT ^T^inJ'ci^lons aforeTaid. For want of 
better Conveniencies when in Holland^ I had this 
Iron Pipe fixed to a thin Board, which I faftened to 
the Rudder of the VefTel D E ; but as I am now fall- 
ing on a properer Method to fix this Iron Pipe 
which I could not well do in Holland, fince the 
cold Weather was To far fet in, that it would not 
allow me to make more Experiments than I did on 
that Side, I hope foon to make it appear, that the 
Revolutions are exadly equal in this new Improve* 
ment of the Fork. 
Here then do I offer what I humbly conceive can- 
not fail being of Service to the Community of which 
I am a Member, as well as to all the Maritime 
Powers. Tis the Fruit of feveral Years Study for 
my Thoughts were firft employed on if, when the 
Nation felt To great a Lofs as it did in the unhappy 
I Fate 
