136 



THE MICEOSCOPE 



3219a 



^103 



. 52 



£ s. d. 



Standard Petrological Microscope, with eye- 

 piece analyfeer, with cross-wires, polarising 

 prism ; stand only, in case . . . . 24 7 



Independent swing -out and focussing arm, 

 which enables the condenser to be swung out 

 of the axis .... e-stra 150 



Beoke lens and converging system of lenses, 

 in fitting in stage-plate with small apertures 

 for Becke shadow test to fit under polariser, 

 and plate with apertures of various sizes 

 for linaiting the field to fit into eyepiece slot . 3 15 C 



Plain quartz wedge, ungraduated . . . 2 15 



Quartz wedge, cemented on gs^sum plate (red 



1st order), graduated in Retardations . . 4 10 



High-power Binocular Micioscope, with square 

 stage and rack and pinion focussing and 

 centring substage ; stand only, in case . 32 10 



Stand as No. 3218, but with detachable 



mechanical stage . . . . . 38 10 



High Binocular Microscope, with plain circular 

 lotating stage and centring adjustments ; 

 stand only, in case . . . . . 35 



Microscope as No. 3219, with addition of 

 circular rotating mechanical stage ; stand 

 only, in case . . . . . . 47 



Interchangeable extra monocular large body, 

 with rack and pinion drawtubes extending 

 to 260 mm 7 



Massive Model Microscope, with plain, square 

 stage and attachable mechanical stage, as 

 on page 99, Abbe condenser, dark-ground 

 illuminator in interchangeable mounts, and 

 one extra substage slide ; in case . . 44 10 



Massive Model Microscope, with mechanical 

 stage as illustrated on page 105, with dry and 

 immersion achromatic condenser and focuss- 

 ing dark ground illuminator and one extra 

 substage slide ; in case .... 



Interchangeable high-power binocular body 



extra 



Double extension drawtube, with rack and 

 pinion adjustment . . . extra 



/103 

 " 1104 



3200a 104 



3201a 104 



— 116 



— 103 



NOSEPIECE AND OBJECT GLASS CHANGERS 



3300 20 Dust-tight double nosepiece .... 



3301 20 Dust-tight triple nosepiece . 



3280 20 Sloan object glass changer, adapter, spanner, 



and two fittings ..... 



3281 20 Extra fittings for above . . . each 



3282 20 Case to hold three fittings, with object glasses 



attached in dust- tight spring holders . . 116 



OBJECT GLASSES AND EYEPIECES 



3230 77 IJ-in. Achromatic object glass (32 mm.) . 



3231 77 2/3-in. Aohromaiio object glass (16 mm.) 



3232 77 1/3-in. Achromatic object glass (8 mm.) . 

 3234 77 1/6-in. Achromatic object glass (4 mm.) . 

 3236 77 1/8-in. Achromatic object glass (3 mm.). Oil- 

 immersion . . . . . 6 17 6 



