m in the ship.

All this, which is here pretended, the Proposer is to make good by the
Verdict of some able Men, who also may give a guess, what this latter
Invention may be worth to the owner: And for so much, and no more, he will
stand engaged against {218} any one or more Persons, that he will and shall
resolve the _Question_ above-mention'd, _viz. Whether the Artificial
Tangent-line be the true Meridian-line, yea or no?_ And if he do not, that
then he will loose, and transport to the other Party the whole benefit of
the last mentioned invention. But if, on the contrary, he do prove or
disprove the Identity of the said two lines, to the Judgment of some able
_Mathematicians_, That then so much money be paid him by the other Party,
as the said Invention was valued.

And, whereas there are often Wagers laid about things that concern the
Engagers little or nothing; 'tis thought, that it would concern all
Merchants, Mariners, and all Lovers of the common good, rather to lay
wagers against one another about Things of this nature, where the Gainer
doth gain as well, as if he had laid his wager about something else, and
the Looser hath so far the benefit as well as the Gaine, That he seeth
thereby promoted the thing, that concerns them both alike.

Now therefore, to the end, that the Looser may have his benefit by it, as
well as the Gainer, it would not be amiss, that the condition were made
thus, that the latter should grant the moity of his gain to the Proposer;
that thereby he might be enabled to bring to light both those, and some
other useful inventions, for the Service of Mankind. And to manifest, that
it is not for his own interest only, that the _Proposer_ mentions this; he
is willing to impart from that moity, so received, the full moity again to
any other person within his Majesty's Dominions, who shall first of all
give notice of his Undertaking to prove or disprove the said Identity, and
perform it accordingly within the space of two Months, to be computed from
the present Date. Those that have a mind to engage, may repair to the
Printers of these _Tracts_, where they may know further.

[Illustration]

* * * * *

_A new Contrivance of _Wheel-Barometer_, much more easy to be prepared,
than that, which is described in the _Micrography_; imparted by the Author
of that Book._

This is only an easy way of applying an _Index_ to any _Common Barascope_,
whether the Glass be only a