down the Times of the other, and the two Ebbs intervening, by fubdividing 
the Differences, ht afsignes between two Tides, equally amorgft ihcm. In 
all which, though there may be Errors, that is not to be confidered, feeing 
the Diffcin is to Gorreft and State the Times of the Tides exaHij by Expert- 
mentf, afcer this method. Mr. ftates the High waters to fall out ac 
» ^London- Bridge conftantly, when the Moon is 46. deg» 30^ min. to the 
j^e^ wardot the Meridian* For the Times, he marks for them, are made 
up by adding every day 5. hours, 6 minutes, to thofe in his T«i/# for know- 
ing the Time of the Moons coming to the South. 
The Firft Table confills of t^o Parts, and each part of fsur CoIhmms. 
The firfl part marks the Tides and Ebbs from the day of the NewUoon to 
its Full ^The o/^^r^from the Full to the next Ntyv. The firf^ C^umn in both 
parts hath the day of the Month and Week .iT/. ftandirg every where for 
A^ormn^^ and A for Afternoon, The third Column hath the CbaraHer 
of the day of the Week pre/ixt to the Hour and Minute of the High-water, 
|hd anfwtrirg to the day of the Month. The /^/Column hath the fame for 
the time of Low-water, varying the CW/fcr^-r of the day, as often as the 
low water falls out more early than the High- water. Inihli Example hc^ 
tween ahe faid New Moons there falls out in all juft 57. periods of the Tide 
or Flowing water, and 5 8^. of the Ebb or Low water whichnurobers vary 
according to the Intervals of the Moons changes but with what conftancy 
and exadnefs, is to be inquired after : Which whofoever undertakes to do, 
may keep fuch a T ahle^ as is here propofcd, in a Book by it felf. 
l he other Table doth in 9. Ce umns comprehend the particular Obferva- 
tions of the Degrees of the Kifingand falling of the Tides, andtheother 
things fpccified at the Tops of them : The prft Column marking the Hour 
at.d^v^.inut common to all the feveral Obfervations. Eaihiiour is divided -in 
5 » equ?l Parts, ihat number of Obfervations bcirgonly pitch'tupon by way 
of ExAm^le : I he numbers may cife be varied at pleafure , when other more 
frequent Obfervations are thought fit to be made, or when they prove too 
frequent and laborious- though'the moft frequent are moft dcfirable, till 
competent information of all particulars be attained* 
The Rijin^ of the Tide from Low. water to the higheft pitcht of the Full 
Sea, is4iere fuppofed to be 60. foot^ And the Deg'-ees of its rifing every 20, 
Minuts, to be in the Froporticn of Signes , The whole time of Flowing fup- 
poft d to be 6. hours. But this Example will ferve for marking the Spaasoi 
the Increafing or IUfing,as veil as of tnefalling of the watcr,in order to the In- 
veftigation of their Profortiens to one another ,whcn the Dnration of the Tide 
exceeds 6, hours by any number of minuts^ as well as forjuft $• hours- 
feeing they may be cafily collcdcd from any Number of Obfervations their 
precifc Time and that of the Duration of the waters Rifing and Falling'( that 
is, the juft interval bepwcen the High-water and Low- water) being known % 
This C alculation by Signes being only fet down Conjecture ^Homng 
f om Obfervations of the Motion (of the water in its Rifing and Failing, 
