1in the beginning they are ſmall, and afterwards become greater
and bigge; and the reaſon is moſt manifeſt, becauſe in the be
ginning they are very ſwift, and afterwards gradually relent
their impetuoſity, and motion, ſo that in the beginning of the
excurſion that they make, they ought to be ſmall, and after
wards to grow bigger, as in the effect is ſeen.
and bigge; and the reaſon is moſt manifeſt, becauſe in the be
ginning they are very ſwift, and afterwards gradually relent
their impetuoſity, and motion, ſo that in the beginning of the
excurſion that they make, they ought to be ſmall, and after
wards to grow bigger, as in the effect is ſeen.
APPENDIX. I.
Into the errour of not conſidering how much the different
velocities of the ſame running water in ſeveral places of
its current, are able to change the meaſure of the ſame
water, and to make it greater, or leſſe, I think, if I be not
deceived, that Ginlio Frontino a noble antient Writer, may
have faln in the Second Book which he writ, of the Aqueducts
of the City of Rome: Whilſt finding the meaſure of the Water
^{*}Commentaries leſſe than it was in erogatione 1263. Quinaries, he
velocities of the ſame running water in ſeveral places of
its current, are able to change the meaſure of the ſame
water, and to make it greater, or leſſe, I think, if I be not
deceived, that Ginlio Frontino a noble antient Writer, may
have faln in the Second Book which he writ, of the Aqueducts
of the City of Rome: Whilſt finding the meaſure of the Water
^{*}Commentaries leſſe than it was in erogatione 1263. Quinaries, he
thought that ſo much difference might proceed from the negligence
of the Meaſures; and when afterwards with his own induſtry he
meaſured the ſame water at the beginnings of the Aqueducts,
finding it neer 10000. Quinaries bigger than it was in Commenta
riis he judged, that the overplus was imbeziled by Miniſters and
Partakers; which in part might be ſo, for it is but too true, that
the publique is almoſt alwayes defrauded; yet nevertheleſſe, I
verily believe withal, that beſides the frauds of theſe Officers,
the velocities of the water in the place wherein Frontino meaſu
red, it might be different from thoſe velocities, which are
found in other places before meaſured by others; and there
fore the meaſures of the waters might, yea ought necſſarily to
be diffcrent, it having been by us demonſtrated, that the mea
ſures of the ſame running water have reciprocal proportion to
their velocities. Which Frontino not well conſidering, and find
ing the water in Commentariis 12755. Quinaries in erogati
one 14018, and in his own meaſure ad capita ductuum, at the
head of the fountain 22755. Quinaries, or thereabouts, he
thought, that in all theſe places there paſt different quantities of
water; namely, greater at the fountain head then that which was
in Erogatione, and this he judged greater than that which was
in Commentariis.
+ Commentarius
beareth many ſen
ſes, but in this
place ſignifieth a
certain Regiſter of
the quantities of
the Waters in the
ſeveral publique A
qu ducts of Rome;
which word I find
frequently uſed in
the Law-books of
antient Civilians:
Andby errogation
we are to under
ſtand the diſtribu
tion or delivering
out of thoſe ſtores
of Water.
beareth many ſen
ſes, but in this
place ſignifieth a
certain Regiſter of
the quantities of
the Waters in the
ſeveral publique A
qu ducts of Rome;
which word I find
frequently uſed in
the Law-books of
antient Civilians:
Andby errogation
we are to under
ſtand the diſtribu
tion or delivering
out of thoſe ſtores
of Water.
APPENDIX II.
Alike miſtake chanced lately in the Aqueduct of Acqua
Paola, which Water ſhould be 2000 Inches, and ſo many
effectively ought to be allowed; and it hath been given in
Paola, which Water ſhould be 2000 Inches, and ſo many
effectively ought to be allowed; and it hath been given in
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