io8

Plate

XXVI.

fcig- 3-

Fig* 4*

Hydraulics.

Spheroid, parallel to the Equator, would be aconsequently in any Parallel of Latitude, thewould be at an equal Distance from the Earth’s S 3 'face every Moment of the diurnal Revolution, or 11tural Day.

31. Suppose the Moon were removed from the y

rection of the Earth’s Axis* and posited at 8, then >the Axis of the aqueous Spheroid A B be turned ^ :wards S, and make an Angle with the Earth’s Ax> s t,A T P or B T N. Then we observe, that since C, 'are the Places of lowest Water, that Parallel I Kpasseth through the Point I on one Side the Equ^jand LM which pastes through M on the other, ydivide the Earth into three Zones, in two of wb'^iviz. E N K and L P M, there will be but one ‘Tide L |Day, of the fame Kind ; for Instance, in the P 3fa jjE F, a Person at F will have high Water, andlow Water'12 Hours after. Again, in all the 2 ° jIK ML, there will be two Tides of the fame Fheach Day, as is evident from the Figure. These ymits, or the Arch Q_I or O M, is the Complem eJ1the Moon’s Declination from the Equator. ^

32. If the Moon at S be over the Equator*longer Axis of the Spheroid AB will now coiP jwith the Plane of the Equator QO, and theAxis C D with the Axis of the Earth N P.obvious, that in this Situation of the Spheroids p,Waters in the Parts A, B, with respect to those at t£ fwill give the greatest Difference at high and low v ))( jpossible to all Parts of the Earth ; and that there ,s ^>Place but those two at the Poles N, P, but wb 3 ^,two Tides of Flood, and two of Ebb every 24 W jrAnd this Difference of the Flux and Reflux v"'

crease from the Equator to the Poles.

33. I have already observed that the greatest F $tion of the Waters is not when the Luminary is $Meridian, but about three Hours after, becaw e yMotion communicated to the Waters during tFf pi' 1rival to the Meridian is not immediately destroyc 3 ’^'remains some Time, and receives a farthertion from that which i c imprefs’d for about three P Jafter. For the fame Reason, we observe, the S r ^