(iiB) 
iiy one or more Perfons,thac he will and ftiall refolve the^ejlzon 
above-meatioa'd, vis^. Whether th Artificial TangentMne be the 
true Meridian-line^ yea or no ? And if he do not^that then He will 
loofe, and tranfport to the other Party the whole bci efit of the 
laft mentioned invention. But if^on the contrary^he do prove or 
difprove the Identity of the faid two lines, to the Judgment of 
fome able Matbematieianj.Th-^t then fomuch money be paid 
him by the other Partyjas the faid Invention was valued. 
And, whereas there are often Wagers laid ab©ut things that 
concern the Engagers little or nothing ^ 'tis thougbt, that it 
would concern all Merchants, Marriners, and all Levers of the 
common good, rather to lay wagers againft one another abottt 
things of this Nature, where the Gainer doth gain as welt as if 
he had laid his wager about fomething dfs$ and the Loofer hath 
fo far the benefit as well as the Gainer^That he feeth thereby 
promoted the thing,that concerns them both alike. 
Now therefore, to the end, that the Loofer may have his be-i 
ncfit by it, as well as the Gainer^ it would not be ami/sj that the 
condition were made thus,that the fatter fliould grant the moity 
of his gain to the Propafer 3 that thereby he might be enabled to 
bring to light both thokj and fome other ufefurinventions, for 
the Service of Mankind. And to manifeft, that it is not for his 
own intereft onely, that the Propofer mentions this 5 he is willing 
to impart from that moity, fo received, the full moity ag^in to 
any other perfon within his Majefties Dominions, who fhallfirflr 
of all give notice of his Undertaking to prove or difprove the 
faid Identityj and perform it accordingly within the Ipace of two 
Months,to be computed from the prefent DateeThofe that have 
a mind to engage, may repair to the Printers of thefe Tra^/y 
where they may know further. 
A nefp Contrivance Wheel-Barometer, much mm eafyto 
be prepared^ than that^ whkhisdifcribedin the Microgram 
. phy ; imparted by the Author of that Book- 
This is only an ealie way of applying an Index to any Commm 
larojcope, whether the Glafs be only a Single Canpj or have a 
Touiid Bolthcadat the top. And by the mwaus thereof , the 
yariatioB^ 
