\ 
( ) 
could about it, but more efpecially to note the Time of 
Continuance of total Darknefs, as requiring no other In- 
ftrument than a Pendulum Clock with which mod Perfons 
arefurnilh’d, and as being determinable with theutmoft 
Exadtnefs, by reafon of the momentaneous Occultation 
and Emerfion of the luminous Edge of the Sun, whofe 
leaft part makes Day. Nor has this Advertifemcnt failed 
of the deftred Effecft, for the Heavens having proved ge- 
nerally favourable, we have received from fo many Pla- 
ces fogood Accounts, that they fully anfwer all our Ex- 
pectations;) and are fufficient to eftablifh feveral of the 
Elements of the Calculus of Eclipfes, fo as for the future 
we may more fecurely rely on our Predictions ; though it 
mud be granted, that in this our Aftronomy has loft no 
Credit. 
The Day of the Eclipfe approaching, I received the 
Orders of the Society to provide for the Obfervation to be 
made at their Houfein Cranc-Court, and accordingly I pro- 
cured a Quadrant of near 30 Inches Radius, exceedingly 
well fixt with Telefcope Sights, and moved with Screws 
fo as to follow the Sun with great Nicety; as alfo a very 
good Pendulum Clock well adjufted to the mean Time, and 
feveral Telefcopes to accomodate the more Obfervers. 
In order to examine both Clock and Quadrant, I, on 
the 10 th of April , obferved the Diftance of the upper Limb 
of the Sun from the Zenith 36°. 16', and the next Day 
3 5 0 . 58'; by which it appeared that the Diftances from the 
Zenith taken by this Quadrant ought to beencreafed by 
about one Minute : and that Allowance being made, by 
feveral Obfervations taken before and after Noon on the 
faid 2 1 fi Day, the Clock was found to anfwer the appa- 
rent Time or Hour of the Sun with fufficient Exatftnefs, as 
not going above 10" too faft. The next Day April n°, 
juft before the Eclipfe began, we took three Diftances of 
the Sun from the Zenith, viz. at y h . 42'. 51". A. M. the 
correCl 
