counterpoife P to be, and that either initsowne 'intrinfick 
weight (in Ounces and parts of Ounces) or elfe in its poten- 
tial weight, by being rais'd higher in the Quadramt QJT- 
7- ■ The skrewing up the Stage of the Movement at S Fig, ^ . 
willraife the Counterpoife higher in the Quadrant Q T- by 
Prop. and therefore potentially heavier. And from hence 
:lppears ( I take it moil: clearly j both the reafon ot the due 
adjuftment of the motion of the Train to the exadt meafure 
of au hour, and what weight is to be affign'd to P, that moves 
it 5 and that we are not confind to fcruples and grains, but 
are allow'd fuch a confiderable latitude, as it is not ealy to 
erre therein. I fhall give a word or two lor direction in 
that Particular and conclude. Therefore having fet the 
Stage ( by the help of the arqhed Skrew j at the elevation 
of about 10 degrees ; place the Movement thereon, and try 
what weight hanging at the end of the - e^ts M P while ftir 
the Train, meanwhile holding the Movement with the hand 
in fuch a pofition, as the Vedi^s may make an Angle of about 
3 o degrees with the perpendicular M T : then let the Move- 
ment loofe to undulate upon the Stage ; and when the vi- 
bration ceafes, obferve to what degree of the Quadrant the 
^ VeUis poyn ts, and at the fame time mind the pulfes of the Bal- 
lance. If at thi$ Obfervation, the weight lies low ( as for 
inftance between 25* and 3 5* degrees of the Quadrant ) .and 
the beats of the Ballance are guefs'd to be not much diife- 
rent from their due time ; the weight P is well enough pro » 
portion d ; for herein ( as I faid ) there is a confiderable la- 
titude, and if it chance to be much heavier then is ablblute- 
ly needful, that excefs will be moderated by skrewing down 
the Stage ; and if it be not abfolutely too light, its defeat will 
be compenfated by skrewing the Stage higher. Therefore 
of thefe two extremes, choofe the former ; for the fewer de- 
grees that P arifes in the Quadrant beyond what is abfolute- 
ly neceffary, it will (forreafons very obvious) be fo much 
the better. 
And thus Sir, if I have not err'd in my apprehenfionsi you 
have prefented to you the Scheme of fuch a Movement, to- 
gether with the demonftratiou of it s Motion, as will fully 
anfwer the Problem propos'd. Upon the careful review of 
what has bin faid, tho 1 find fome defeats in poynt of me- 
thod, and not alwaies fo natural a Syntax in the periods as 
might have bin : Yet I thing neither of that confequence, as 
to render my meaning anywhere unintehigible, or my rea- 
fon^Jig{s conclufive s tho both of them lacknowledg to be 
fuclffe^Its, as not to deferve your pardon without a juft ex- 
cufe. ' i have drawn confequences from fome aiFertions not 
prov'd^ 
