( 47 ) 
In the Firft of thefe Figures, F reprefents my 
u James'% Park, through 
the Rudder of which a fmall Spindle paffes (in an 
Iron Pipe) of which H G is the Length. To the 
Point G are Mened the four Iron Fins, or Flyers, 
D B and A C, to which they are fixed, lying in an 
horizontal Pofition. Thefe Flyers are fo contrived as 
to have full Play in any Motion of the Boat. To 
the Point H, which is the upper Part of the Pipe 
and Spindle, is fixed the Dial E : Now the Boat 
being put into Motion, the Flyers move according! v 
which proportionally affefting the Spindle, the M^’ 
non IS thereby communicated to the Dial, which mav 
be fitted to ftrike the Miles or Leagues that the Vet 
lei runs. 
But to defcribe the firft Movement of this Ma. 
z. reprefents it unfixed. 
The Crofs, or Bars D B and A C, as I faid before, 
lie flat, or in an horizontal Pofition ; the Arbor or 
Spindle, which is perpendicular thereto, fcrews into 
rte Point G, and pafles through an Iron Pipe to the 
Dial, in manner aforefaid. Tlie Flyers A, B, C and 
D being fitted to move in any Motion of the Boat 
the Bars are accordingly affeded. This Inftrument 
IS fo contrived, that two of the Flyers on one Side 
ftall always refift the Water in the Motion of the 
TnmL'^Th Way in their 
Turning. The refiftmg Flyers in this Figure are A 
and B, and P anjl C will be the fame when they* 
come into their Pofition; for they refift and give Wav 
alternately fo long as the Motion continues, which 
IS always circular ; and fo truly does it revolve, that 
H ’ be 
