PRICE OF INSTRUMENTS AND APPARATUS 137 



1/12-in. Achromatic object glass (2 mm.), Oil 



immersion ..... 

 1^-in. Apochromatio object glass (40 mm.) 

 2/3-m. Apochromatio object glass (16 mm.) 

 2/3-iii. Apochromatio object glass (14 mm.) 

 1/3-in. Apochromatic object glass (8 mm.) 

 1/6-in. Apochromatic object glass (4 mm.) 

 1/6-in. Apochromatic object glass (4 mm.), with 



correction collar .... 

 1/12-in. Apochromatic object glass (2 mm.). Oil 



immersion ..... 



42-mm. X 6 Huyghenian eyepiece . 

 25-mm. X 10 Huyghenian eyepiece 

 17-mm. X 15 Huyghenian eyepiece 

 45-mm. x 6 Compensating eyepiece 

 30-mm. X 8 Compensating eyepiece 

 22-mm. X 11 Compen.«iating eyepiece 

 15-mm. X 17 Compensating eyepiece 

 10-mm. X 25 Compensating eyepiece 

 Beck micrometer eyepiece 

 Eyepiece with indicator 

 Eyepiece with cross-wires 

 Erecting eyepiece 



£ !J. 



LARGE SIZE EYEPIECES 1-41 INCH DIAMETER OF TUBE 



3257 85 Eyeshade 



3253 88 42-mm. X 6 Huyghenian eyepiece . 



3254 88 25-mm. X 10 Huyghenian eyepiece 



3255 88 17-mm. x 15 Huyghenian eyepiece 



APPARATUS FOR ILLUMINATING OBJECTS 



3285 26 Small Abbe condenser, fitting with iris dia- 

 phragm on Microscopes No. 3210 and 3211 . 



Set of patch-stops for above .... 



Large Abbe condenser in fitting with iris dia- 

 phragm and swing-out tray for colour screens 

 with coloured and ground glass . 



Set of three patch-stops for above . 



Beck dry aohronxatic condenser, 1 N.A., lenses 

 only in mount, with standard object glass, 

 screw thread ..... 

 3288 27 Beck dry achromatic condenser, 1 N.A., com- 

 plete in fitting with iris diaphragm and swing- 

 out tray, grey and green glass . 



Set of three patch-stops for No. 3288 or 3290 . 



Beck dry and immersion achromatic and apla- 

 natic condenser, 1-3 N. A., in mount, with iris 

 diaphragm and tray for patch-stops and with 

 ground and green glass double-wedge light 

 moderator ...... 



Traviss expanding iris patch-stop . 



High-power dark-ground illuminator, optical 

 portion only in mount, with standard object 

 glass thread ...... 



3296 34 Illuminator as above in plain substage fitting . 



3285p 

 3286 



3286p 

 3287 



3288p 

 3291 



3284 

 3295 



33 



26 



33 



27 



33 



28 



33 

 34 



4 5 



15 



7 



