( 2l6 ) 
feen together. 4. Tn the Method offetting it exadly perpendicular 
to a Sec0f^d,\fmcd be.j.In its Fixation ^ndMaio^^'n beingfo fixed 
and moved,char,if once fee to the Objefts,it continues to move along 
wirh them, as long as 'tis neceflfary to continue, or be very certain 
of,any Obrervation.6.In its being to be made and adjufted without 
difficufty, and not to be put out of order without defign ; as alfo in 
its g; eat eafmefs of being reftified and again adjufted.y.In its being 
not very chargeable. ^ 
All thefe perfeflions the Jufhor explains, and endeavours to 
make good, by defcribingand delineating this Inftrument and all 
the parts thereof, and endeavouring to obviate fuch exceptions,as he 
fore fawmighnbemade againft it.Toall which he annexes occafion- 
aliy fomething that relates to the priority of the Invention of the 
Circular pendulum \ and likewife a Defcription of a Wheel-work, 
which, he faith ^ may be called cheperfefliono^ fuch work, having 
the perfefteft Idea, he thinks, that toothed Wheel-work is capable 
of, performing the fame effeft,as if the Wheel and Pinion had an in- 
definite number of Teeth. Which done,he defcribes the Fnmefor 
keeping the Inftrument, which is the main Argument of this Book, 
in its Perpendicularity, and yet always in the Azimuth of the Cae- 
leftial ob;e(a;with a Digreflionof the great life of this Principle in 
Dialling, Equalling Time, Giock-work, (^r. 
He mentions alfo a Mechanical way, he hath, of calculating and 
performing y^r/V/^w^'^/ir^/ operations, much quicker and more cer- 
tainly, than can be done by the help of Logarithmes^ 
He concludes the whole by fliewing divers of the particular Ufes 
of this New Quadranr,as r.For meafuring the Refraftion of the Air. 
2. For regulating the Places of the Fixt Stars and of the Planets. 
3. For ftating the Latitude of Places. 4. For examining the Influen- 
ces of the Planets on the Earth. 5. For meafuring the quantity of a 
Degree upon the Earth. 6. For meafuring feen Diftances. 7. For Lc- 
veiling.?. For taking the Diameters of the Sun,Moon,and other Pla- 
n€ts.Where,by the by,are mention'd two other Inftnjments,one for 
taking Diameters to Seconds ; the other, for looking on the body of 
tlie Sun without harming the eyes. 
Errata left uncorreSted in Numb, r ©8. 
Pjf».l7o. K20. x^Siorts ofSaU^ p. l85t l.penulr. r,fovutmes to the thickntfi ofafim* 
f .1S7. 1 15. x%\iotight, ibid. 1.30. r>dicf coagulate, 
LOjSfDOISr, 
Printed for Joh>t Mar tji/ftVimer to thi Ecyd Society, 1674. 
