7'he Microfcope explained . v 
circulation of the blood. No. n. is a wier fcrew to 
afiift in cleaning the tubes, or to difcharge their contents. 
If the animalcula in fluids, or any minute infedl, are 
under confideration, it will fometimes beneceflary to ex¬ 
clude fome part of the light which is reflected from the 
mirror Q, by putting the cone No. 4. upon the bottom 
1 of No. 3. it being firft put into the ftage at T. 
The nippers No. 5. are for confining any objedt, and 
are to be placed in one of the fmall holes near the ex¬ 
tremities of the ftage, or in the focket r, at the end of 
the chain of balls No. 6. as the pointed nippers t, which 
hold an opake objedt t v, the ftage D D being removed, 
and one of the ftlver fpecula fcrewed to the body of the 
microfcope at C, the flider W brought nearer to the 
Aider V, the ftem X of the pillar belonging to the chain 
of balls, being put into the hole at W, the balls may 
be readily managed to give a proper diredtion to the ob¬ 
jedt tv, the obferver’s back being turned towards the 
window, fo that the refiedtion from the mirror Q, of 
the fky behind, or on one fide, may fall upon the ftlver 
fpeculum, and thence be returned upon that part of the 
objedt t v, which is to be examined and is next the eye. 
No. 7. is a box, containing fpare talcs to fupply the 
ivory Aiders. 
No. 8. is a double convex lens, to be ufed as a mag¬ 
nifier in the hand. 
Laftly, remove the body A B C ? and put the ftage 
D D in its ftead, at B in the arm F ; alfo put the pin 
f of No. 9. into the hole at z in the top of the bar K L, 
fig 3. place an object upon the ftage, and fcrew any one 
of the magnifiers before defcribed into the end e of the 
Aiding bar e g, and then this inftiument becomes a Angle 
microfcope to which all the above apparatus is applicable ; 
but for the ufe of the Angle microfcope only, there are 
added three more magnifyers whofe foci is very fhort. 
' b 3 There 
