2cvi The Microfcope explained . 
Fig. 8. reprefents the pyramidical camera obfeura 
mounted for taking perfpedtive views, from any profpedb 
the draftsman has a defire to imitate. After having 
chofe the fpot or point of fight from whence he would 
make his perfpedtive pidture, let him caufe a table to be 
placed there, and fet the camera upon it. Let him lit 
down before it, turn his back and the camera together, 
while he is looking through the apperture a be, until he 
finds the moll agreeable pidture he can obtain (from that 
point of fight) upon a flieet of paper already placed on 
the infide of the bottom of the inftrument for that pur- 
pffe. This being done, place your forehead clofe to the 
cufhion a b c, with your nofe on the outfide at a, that 
you may be able to breathe the free air, having firft 
buttoned the band m n, upon your wrift; then proceed 
with a pencil in your hand to trace the out-lines of every 
objedt in your landfcape, which will, when completely 
lhaded, be a true reprefentation of that perfpedtive view. 
Your out-lines being finifhed, take out the drawing; put 
another clean paper into the inftrument, it ftanding in 
the fame place; fit on one fide of it that you may look 
into the camera occafionally, and then you may fhade 
your drawing agreeable to nature. 
From the preceeding experiments and various trials 
made before the inftrument was compleated, to exhibit 
microfcopic objedts by the help of a lamp without the 
fun, the two following curious applications of the 
camera obfeura offered themfelves, which w r e could by 
no means reject. 
Fig. 9. reprefents the pyramidical camera obfeura 
placed horizontally upon a table ; the mirror r in fig. 8. 
being taken out of tfie fquare Aiding tube P Q, and the 
flat cover of the faid tube taken oft', we put one of the 
convex lenfes into the groves made for that purpofe, 
near the end of the fquare tube at P» fig. 9. 
Diredt 
