PHILADELPHIA 
For examination of hyaline and other casts, crystals, etc., in urinary work, 
the Abbe condenser can be removed and the smaller iris diaphragm which is 
attached to the substage, can be used to its best advantage by reducing the aper- 
ture and lowering the plane of the iris by the focusing screw. This is a very 
important improvement. 
Heretofore diaphragms with fixed openings have generally been employed 
for controlling the volume of light entering the objective, except when the con- 
denser is used, in which case an Iris Diaphragm has been placed below the 
condenser. 
This construction of the Iris Diaphragm is so designed as to be used in the 
plane of the stage or below it, and with or without the condenser, and to give 
any desired size of aperture, even sufficient for the condenser to be used 
through it in oil immersion contact with the slide if desired. 
BBl. Stand BB with i eyepiece, f inch and I inch objectives and Iris 
diaphragm 
BB2. BB I and double nosepiece • 
BBS. Stand BB with 2 eyepieces, § inch and i inch objectives and Iris 
diaphragm 
BB4. BB3 and double nosepiece 
BBS. Stand BB with 2 eyepieces, 2 inch, f inch, and ^ inch, objectives and 
Iris diaphragm 
BB6. BB5 and triple nosepiece • • 
BB7. Stand BB with 2 eyepieces, f inch and i inch, inch oil immersion 
objectives and Abbe condenser in mounting with 2 Iris dia- 
phragms • • 
BBS. BB7 and triple nosepiece • • • 
BBla. Stand BB with i eyepiece, f inch and i inch objectives. Abbe 
condenser with 2 Iris diaphragms • 
BB2a. BBia and double revolving nosepiece 
BB3a. Stand BB with 2 eyepieces, t inch and h inch objectives, Abbe 
condenser, 1.20 N. A., and 2 Iris diaphragms 
BB4a. BB3a with double revolving nosepiece 
The BB4 is the most complete outfit for medical work, exclusive of the study 
of bacteria and blood. 
The BBS is the most useful outfit for medical work inclusive of bacteriology 
and blood examination. 
One-fifth or % objectives will be substituted for ye if desired, at same price. 
New complete substage, described on page 18, can be supplied on any of 
above stands at an additional cost of $20. This substage is, however, not neces- 
sary for medical work. 
Each BB Microscope is furnished in polished case with handle and lock and 
receptacles for eyepieces, objectives and accessories, with book " Manipulation of 
the Microscope," by Edward Bausch. 
$48 00 
53 00 
50 00 
55 00 
56 00 
63 50 
87 50 
95 00 
60 00 
65 00 
62 00 
67 00 
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