419
Tuesday. March 16. 1679.
[In margin]Present
S
r. Rob: Redding
M
r. Hill
M
r. Hooke
M
r. Hally
M
r Perkins
we fir
st examined the weight of Regulus of antimony in
air & water and found the weight to be {in air 135 1/2 / in water 115 3/4 }
whence the specifique Grauity is 6 68/79
we
confound al
so the weight of co
mon Iron {in air 697 / in water 606 1/2 }
whence
the specifique Grauity . 7 127/181
The weight of the wiredrawing Plate was {in air 465 3/8 / in water 399 1/8}
whence its Specifick Grauity is 7 13/530 or 7 1/41.
The weight of the Gold colourd mixture suppo
sed to be made
of Spelter & Copper was found {in air 1317 / in water 1166}
Its Specifick Grauity. 8 109/151 or 8 2/3
Another Peice examined was found {in air 1296 / in water 1146 1/2. }
therefore its specifick Grauity 8 200/299 or 8 2/3.
The mixture of Antimony & Iron did not succeed
Ref: CELL/RS/HF_421 © Centre for Editing Lives and Letters
