( 6 o8 ) ; 
Inch fhort of the faid Place, the blue Image moft di- 
ftind, and diftind alone ; that is an Inch and { nearer 
the Glafs. Inftead of Vermilion the red Paper may 
be painted with Carmine or Lake , but it will not do fo 
well, as was then tried ^ nor does TruJJlan Blue do fo 
well as Ultr amarine. The beft Way is to heighten 
the V er million with a little Carmine , and the Ultra- 
marine (which has too much white) with Indigo } 
and then there will be a Space between the two di- 
ftind Bafes where both the Images will be indiftind. 
N. B. I made the Experiment yj ith fuch Colours , in 
the Tear 1722 } but now I ufed no Mixt lire s y that any 
Body elfe might repeat the Experiment . 
The fecond Figure reprefents the Box with one Side out, 
whofe Place is S' db B j eg is the Hole for theTube in the 
Door of the Forelide, * c d • rr the Hole in the 
Back to receive the Piece R with its painted Paper. 
The third Figure is the Box open before, with the 
Candles and Paper in it, the fame Parts being marked 
with the fame Letters as in the other Figures. 
N. B. I made the Experiment in this Manner, be- 
caufe Signior Rizzetti attributed the different Foci of 
the Colours to different Inclinations, which could not 
be alledged here j the red and blue being, as he had 
defired, fucceffively fixed in the very fame Place: And 
he fays (Page 6 ^i)addidi permancntes colores a lumine 
direilo diver fa inclinatione illuftratos qmftante In - 
clinatione in lentem incider c. Nay, more than this 
was performed in the Experiment j for as the Candles 
were fixed, the Light fell upon the painted Paper always 
with the fame Incidence. 
EX PE. 
