(438) 
on with it. By this means, the variation may be had well enough 
yo degrees, halt degrees, and fome fmaller parts 5 and if carefully 
ahdcurioufly profecu ted, even to Minutes too. But it will not be 
amifs, to do it both by theSun and Stars^ that the greater certain- 
ty may be attained, 
: 2. T^o carry l)ippng-3^edlesm^ . 
THe Biffing' Needle is tobe ufed at leaft as frequently as the 
former Experiment is made , aild in the fame places , in or- 
s der to the fame purpofes, AH that needs be faid of the Manner, 
fe^ th^t when the Dipping of the Needle is to be examined, the 
Circle, in which it moves, is to be hung perpendicular, and turned, 
till it be juft mt\it Magneticd Meridian^v^h^xt it dippeth moft, 
and thedegrce of its depreflion under the Horizon is to be noted in 
zTaile/ StQ Figure I. 
^■^p mar^^carefuily the Fltmin^ MdEbhwgs 
' i>f ^he Seay in as many places as may he. 
TlfePiaiticulars:herc to be regMed^atfe/i. The precife times 
of the beginnings of the Flood and Ebbjinall Rivers,Bayes, 
at- Promontories, C apes^ and in all Roads,HarbourSj&c. 3.Which 
way Currents run in all places, with their Times, Changes, 8^c. 
What perpendicular Diftance there is, betweefi the higheft 
reachof che.!I:ide,and loweft of the Ebb, both of all Spring- 
Tides and .%ap-Tide?, with th^eir irregularities, ^c. 4. What day 
of the Moon's age^^and what times of the Year the higtieft and 
ioweft Tides fall out and all other confiderable Accidents obfer- 
vflble; in Tides, chiefly in. and near all Sea^ ports. Harbours, Roads, 
Iflands, si. )^^[St/N^kns'^^l^^^ The pofition of 
the.\\fkjdiit cvfeiyiOb&tfVacidn 6^ 
