290

mr. Hooke Produced two Experiments in order to make his
Theory of fire more euident.

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The first was a charcole weighing 128 graines putt into
a box of Iron wth. sand enough to fill the cauity of the
iron box between not filld by the cole, and therein screwed vp
very close by an Iron screwed pin then the same was putt into
the fire and there for the space of two houres kept very hott
namely of a bright Red hott after which the said Iron was
taken out of the fire & suffered to coole then opened & the
cole being taken out & weighed It was found that the said
cole was . . . /to haue/ Lost but a graine and half of its weight wch
was attributed to the moysture that might be in the said
cole when putt in. It was further notable that the shape of
the outside of the cole was not altered nor any way Con
sumed./
The 2d Expt. was the Setting of . . . /a/ crucible
full of niter in to a very hott fire in wch. It was made Red
hott and the Peter was found not to burne till a ^ /sulphureous/ substance
was Putt into it. such as wood, cole, Brimstone or the like
vpon the iniecting of any of wch. there was presently produced
a fire & flame by wch. those substances were consumed
whence he argued that the nitrous part of the peter was
that wch. corroded the ^ /sulphureous/ body, and thereby the Alcalizate salt of the
Peter was left behind & augmented by parts of the cole taken
into it self. /

Ref: CELL/RS/HF_292  © Centre for Editing Lives and Letters