of Metals for reflecting TeleJ copes. 303 
diately after which the metal muft be ftirred with a 
wooden fpatula, and poured into the moulds, 
I wiili I may not be confidered as tedious in the above 
detail; but as this bulinefs caufed me a great deal of 
trouble, I was willing to give fome account of the means 
by which I was freed from this difficulty ever after. 
Perhaps, indeed, the whole of this procefs may be unne- 
ceffary, as many years lince, I communicated this com- 
polition, and I believe at the fame time the method of 
preventing the pores, to the late Mr. peter collison,, 
a member of the Royal Society ; and likewife two or three 
years lince, at the defire of my brother, to Mr. michell. 
Although it be poffible, therefore, that this method is 
generally known, yet, as I have frequently of late feen, 
fpecula with this defect, and obferved metals of fome 
of Mr. short’s telefcopes which are not quite fo per- 
fect as could be wiffied (though they are all exqui- 
litely figured) I was willing by this publication wholly 
to remove any future embarraffment of this fort, and 
to furnilh workmen with an excellent compofition for 
their metals. And would the Royal Society be pleafed 
to honour the procefs with a place in their records, I 
know of no other method fo proper to give this, as well 
as the following information, a general notoriety. 
The metal being caft, there will be no occafion for 
the complicated apparatus directed by Dr. smith, for 
grinding 
