means ^ie Counterpoise will rife and fall (Tower ; and cbnfequently 
lefs proportions, than the weight it felf, the firft Pulley may have upon it a 
Wheele or two, to turn Indexes it any proportion required, fo as to give the 
minute parts of the motion, and degrees of rifings and fallings. All which 
is to be obferved by Pendulum-Watches, that have Minutes and Seconds with 
Cheeks, according to Mr .Hagens* way. 
And becaufe if the Hole, by which the water is let into the Pump be as 
large as the Bore of the Pump it felf, the weight that is raifed by the water 
will rife and fall with an Undulalation , according to the inequality of the 
Sea’s Surface, ’twill therefore be fit, that the Hole, by which the water en- 
ters, be lefs than half as bigg as the Bore of the Pump • any inconvenience 
that may follow thereupon, as to the Periods and Stations of theFloud and 
Ebb, not being confiderabie. 
And to the end, that it may appear the better, what are the particular Ob- 
fervations, defired to be made, near Briftol or Cheap-fiow bridg it was 
thought not amifs, to fee them down dittin&ly by themfelves. 
1. Th£tlegreesof the Riling and Falling of the water every quarter of an 
hour (or as often as conveniently may be) from the Periods of the Tides and 
Ebbs • to be obferved night and day, for a or $ months. 
2. The degrees of the velocity of the Motion of the Water every quarter 
of an hour for forne whole Tides together- to be obferved by a fecond 
Pendul - watch and a logg fattened to a line of fosne 50 fathoms wound 
about a wheel. 
3 * The exad meafurosof the Heights of every utmoft High-water and 
Low- water, from one Spring-tide to another, for fome Months or rather 
Years. 
- 4 * The exa& Heights of Spring-tides and Spring-Ebbs for feme Years to- 
gether. 
5. The Polition of the Wind at every Obfervation of the Tides • and the 
times of its Changes • and the degrees of its Strength. 
6. The State of the Weather, as to Rain, Hail, Mitt, Hazinefs, See. and 
the ti mes of its Changes* 
7. At the times of obfervation of the Tides, the height of the Thermo- 
meter^ the height of the Barofcope * the height of the Hygrofcope • the Age 
of the Moon, and her Azimuth* • and her place in all refpedb • And laftly 
the Sun s place ■, all thefe to minutes * 
And it would be convenient, to keepfournalTables, for all thefe Obfer- 
vations, each anfwering to its day of the Month. 
For the Apparatus of all thefe obferyations, there will be particularly ne- 
ceflary. ■' JJg'J- wE 
A good Pendulum* watch. 
A Vane (hewing Azimuths to minute parts. 
An Infirument to meafure the ttrength of the Winde. 
A large and good needle (hewing Azimuths to degrees. 
Ther- 
