On Purifying Olive OIL 187 
of Arts, Manufactures, and Commerce, for their conside- 
ration. 
F. Paynter and Co. Coleman street. 
E. Coleeach, Minories. 
J. Teasdale, Paternoster row, 
W. Rolfe. 
April 22, 1807. 
Reference to the Engraving of Joseph Davis’s Invention 
for securing Window and Door Pannels , Plate &,jig> 
7 , 8 , 9 . 
Fig. 7. Represents a wooden pannel made in the com- 
mon way, the dotted lines show the situations of the tem- 
pered steel rods within the pannel, the holes through 
which the rods were introduced on one side being closed 
up. 
Fig. 8. Shows a section of the same, the small dots in 
the engraving denoting the place of the rods. 
Fig. 9. Shows the instrument on which the pannels 
are laid to be bored. The borer passes through the holes 
L M of the two upright pieces, which keep the borer in 
a straight line to act upon the pannel laid upon the frame 
N. 
No. 36. 
On purifying Olive Oil for the Pivots of Chronometers 3 
By Ezekiel Walker, Esquire 
To Mr . Tilloclu 
SIR— After all the experiments which have been 
made to decrease friction in time-keepers, nothing has 
* Tilloch vol. 36. p.372. 
