409

Munday March 1st. 1679/80.

Present mr. Aston Mr Haughton mr Hooke

The weights hauing born before wth very great care & cu
riousity adjusted and Diuided soe as to be all in a true
proportion to one another and euery thing being well
adiusted and fitted for the tryalls we examined the
weight of the Gold (which was of the best Refined
water Gold) and found the same in the air to be

counterpoysed by In the water was was counterpoysed by Whereas the Specifick grauity to water was a we examined the weight also of Refined Siluer by the same weights and found it in air to be And in water whence the Specifick grauity to water as Then we melted them together and Let them cooll and weighing the masse in air we found it And in water Whence the specifique grauity to water was as But the medium of the specifick grauitys of the Gold & the Siluer was to water as

109 1/4 grains 103 1/2 graines 19 to 1. 109 1/4. 98 3/4 10 17/42 to 1. 215 1/2 graines 199 1/2 graines 13 15/32 to 1 14 3/4 to 1

therefore the mixture was lighter than it ought to haue
been according to the supposition of Archimedes by 2/23 .
that is somewt more than a twelf part.

Then wth. a chissell we cutt the Lump in two and found the
middle part of it Look pretty yellow like Gold as if the Gold
had not been all perfectly mixt wth the siluer though the siluer
in compressed it. we melted it therefore againe in the same
crusible and when cool weighed it and found its weight in
the air 215 1/4 grains & in water 199 1/4 graines. whence its speci
fique grauity was /much/ the same as before vizt 13 29/64 to. 1.
Then we cutt the Lump in sunder wth a chissell as before &
found that the mixture was perfect and the colour of the
Gold wholy Lost.

Ref: CELL/RS/HF_411  © Centre for Editing Lives and Letters