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alledged must fall to the eastward of the perpendicular if the
earth moued.

This proposall of his was highly approued of by the Society
and It was Desired it might be tryed soe soon as could be wth.
conuenience.

Sr. Christopher wren supposed there might be some wt of this
kind experimented by shooting of a Bullet vpwards at a
certaine angle from the perpendicular round euery way -
thereby to see whether the same bullets soe shot would
all fall in a perfect circle round the place where the
Barrell were placed. this Barrell he Desired should be
fixt in a frame vpon a plaine foot and that foot
placed vpon a true plaine euery way, and the mouth of the
gun to be always in the same point ouer the plaine
which way soeuer shot.

mr. Flamstead herevpon alledged that 'twas an obseruation
of the Gunners that to make a ball fall into the mouth
of the Peice It must be shot at 87 degrees and Alledged
he knew the Reason thereof and that It agreed wth his theo
ry. And that a ball shott perpendicularly would neuer fall perpendi
cular. and mentiond Also the Recoyling of a perpendicular Iett of water
But the same was conceiued to arise from some mistake
of the Gunners. in not well taking notice of all cir-
cumstances, for that a body shot perpendicularly would also
Descend perpendicularly and a body shot at 87 would fall con
siderably Distant from the place where it was shot.

Ref: CELL/RS/HF_375  © Centre for Editing Lives and Letters