5T 'he Microfcope explained. xxvii 
As obje&s muft be brought very near the glaffes, when 
the greateft magnifiers are ufed, be particularly careful 
not to fcratch them, by rubbing the Aider againft them, 
as you move it in or out. A few turns of the fcrew C G 
will eafily prevent this mifchief, by giving it room 
enough. 
A fcrole for fixing Wilfon’s pocket microfcope, 
and refletfling light to it by a mirror. 
A BC, fig. 13. is a brafs fcrole, which, for the bet¬ 
ter conveniency of carriage, is fo ordered, as to 
take into three parts, and put into the drawer upon which 
it Hands, with its reflecting mirror, and Wilfon’s pocket 
microfcope. 
The top part of the fcrole is taken off at B, by un- 
fcrewing half a turn of the fcrew; then lift it up, and 
it comes out of the focket. The lower part unfcrews at 
C, and the bafe unfcrews at E. 
The mirror lifts out at F, which with the fcrole lie 
in one partition of the box. 
To apply this fcrole to life, fix the body of the microf¬ 
cope to the top thereof, by the fcrew A, as in fig. 13. 
by fcrewing it in the fame hole as the ivory handle. 
The brafs or ivory Aider being fixed as before defcribed, 
and the microfcope placed in a perpendicular pcfition ; 
moye the refle&ing glafs D in fuch a manner, as to caff 
the light of the fky, the fun, or a candle, direcffly up¬ 
wards, through the microfcope ; by which means it is 
made to anfwer moft of the ends of a double reflecting; 
microfcope, hereafter to be defcribed. 
It is alfo rendered more ufeful for viewing opake ob¬ 
jects, by fcrewing the arm Q_R, fig. 12. into the body 
of the microfcope, at G, then fcrewing into the round 
|iole R, that magnifier which you think, will beft fuit 
your 
