[ Sio ] 
of the polKhIng tool, you warm the pitch by holding 
it before the fire, and prefling it upon the convex 
tool, as before, till it has entirely covered the fur- 
face of the polifl:iing tool ; you then plunge it into 
cold water, till the brafs is quite cold. 
N. B. In order to know if your pitch is hard 
enough, you prefs the edge of the nail of yotir 
thumb upon it, and if it receives an impreflion, the 
pitch is not hard enough. 
You then proceed to prepare this polifhing tool, 
for the laft polifh of your glafs, by grinding this po- 
lifliing tool upon the convex tool with pretty coarfe 
emery, and a fmall quantity of water, in the common 
way that tools are ground one upon another ; but 
this mufl: be done only for a fmall fpace of time, and 
the polifhing tool mufl: have no other preflbre than 
its own weight, for fear of fome of the emery flick- 
ing in the pitch, and you mufl never allow the 
emery to grow dry ; when you have ground the 
pitch fo as to be all over of the fame colour, you 
then wafh the pitch from all the emery with a brufh 
and clean water ; after this you take a bottle of wa- 
ter, and holding the pitch tool in a Hoping pofition, 
you pour water out of the bottle fo as to fall upon 
every part of its furface. 
You then place the polIfl)ing tool in a horizontal 
pofition, and you put upon it fome putty, waflicd 
from all its gritty particles, but it need not be the 
finefl wafhing, and you put a good deal of water 
upon your poliflung tool, mixing the putty and It to- 
gether, and you polifh your glafs upon this pitch po- 
Hflier in the comcnon manner of poliflung glafl'cs. 
After 
