( 38^ ) 
might be effefted by Hydroftaticks ; which when I firft 
communicated, was approved of ; and I am thereby in- 
duced to think it will not be unacceptable to the 
Publick. It is this Let a Lamp be made Two 
or Three Inches deep, with a Pipe coming from the 
bottom, almoft as high as the top of the Veflel, be 
fili'd firft with Water, fo high as to cover the Hole of 
the Pipe at the bottom, to the end the Oyl may not get 
in at the Pipe (and fo be loft) : then let the Oyl be pour'd 
in fo as to fill the Veflel almoft brim full, which muft 
have a Cover pierct with as many Holes as are defign'd 
to be Wycks. When the Veflel is thus fiU'd, and the 
Wycks are lighted, if Water fall in by Drops at the Pipe, . 
it will keep the Oyl always at the (ame height, or¥ery 
near, (the Weight of Water to that of Oyl being, accor- 
ding to KirchersTzhky as xo^^ to 19, which in two or 
three Inches will make no confiderable difference,) If the 
Water runs fafter than the Oyl waftes, it will only run 
over at the Top of the Pipe, what does not run over^- 
will come under the Oyl,and keep it to the fame height. 
