CHAS. LENTZ & SONS 
Cbe Caboratorp Director's 
microscope 
CAS 
At least one microscope of this special form should be included in the equip- 
ment of any laboratory. It is especially suited for the most advanced work in 
bacteriology, pathology, biology, etc. The stand is of large size and is fitted with 
an unusually large stage (being 95 x 115 mm.) and roomy substage, and is, on 
this account, an extremely desirable microscope for bacteriological work, the large 
plain stage being especially adapted for the examination of colonies of bacteria in 
the largest Petri dishes, etc., and is, therefore, very useful for accurate water and 
milk examinations. 
The simplicity of construction of this stand renders it very desirable, even 
when put to constant daily laboratory use, and yet at the same time its large size 
and complete substage attachment commend it for the most advanced work. 
The stand is of brass throughout and is finished in the most perfect manner. 
The base is of special horseshoe form with the back claw extending to form a 
tripod support, insuring the proper stability in any position of the body. The 
pillar is rectangular and the joint has locking device for securing the body in any 
desired position. The substage is the New Complete Substage described on pages 
18 and 19. The upper surface of the stage is of hard rubber vulcanized into the 
metal support (patented). The fine adjustment is by micrometer screw acting on 
the triangular bearing of the arm, which is constructed in such a manner (patented) 
as to do away with all set-screws and springs which by their relaxation and wear 
cause lateral motion or movement of the field, an intolerable defect in a micro- 
scope. 
The head of the micrometer screw is graduated for measuring thickness of 
objects. The coarse adjustment is by means of diagonal rack and pinion of the 
greatest precision, and provided with a special automatic device for compensat- 
ing any wear which may occur. 
The main tube carries a nickeled and graduated draw tube sliding in the cloth- 
lined sleeve. 
The Abbe condenser 1.20 N. A. with dark ground stop and blue glass is a part 
of the microscope stand. 
Each CAS Microscope is furnished in a polished case with handle and lock 
and with receptacles for eyepieces, objectives, and accessories. 
CASl. Stand CAS with i eyepiece, f inch and ^ inch objectives $80 00 
CAS2. CAS I and double revolving nosepiece 85 00 
CASS. Stand CAS with two eyepieces, f inch and inch objectives .... 82 00 
CAS4. CAS3 and double revolving nosepiece 87 00 
CAST. Stand CAS with two eyepieces, | inch and ^, inch dry, and -^^ ii^ch 
oil immersion objectives 120 OO 
CASS. CAS7 and triple revolving nosepiece 127 50 
^ or ^ will be substituted for ^ if desired, at same price. 
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