Microscope Object Glasses. 
ACHROMATIC OBJECT GLASSES. 
Approximate magnifying power. 
Add for each 20 m/m. 
English Focal Numerical With eyepiece. extension of drawtube. 
No. designa- fength. aperture 
tion. x 6. | x 102i Xa: SGI. eee Olan ELS: 
42 m/m. 25 m/m. 17 m/m. 42 m/m. 25 m/m. 17 m/m. 
Ii te m/m. : | | | _ s. d_ 
| | | [ 
3010b 24 GO Fl s0re he 7 13 | 8 5 7 018 0 
3011b 2 50 ‘O8 10 20 7 | 3 6 8 018 O 
3230a 1 32 12 25 45 65 | 4 6 8 ie (ae 
3230 13 32 15 25 45 65 | 4 6 8 ra bay {0 
3238 ] 25 12 38 63 95>) a 10 13 1G 
**3252 1 25 28 38 63 95 | 7 10 13 2 1550 
3231 a 3 16 ef 62 110 155 8 IPs 18 0 16" 76 
3231 x 16 -28 | 62 110 155 8 12 18 EO 
3232 4 8 “54 115 | 200 285 | 20 30 40 355 0 
3239 4 6 “85 180 | 30°) 450 | 30 45 70 ab 5) (0) 
3234 L 4 “85 285 | 490 690 | 40 60 80 S150 
3234 a 4 4 65 | 285 490 690 40 60 | 80 ili AG 
*3236 t 3 95 380 65U 950 50 | 85 | 120 6Gelves6 
*+3237 L 3 2 | 3802-650 950 50 85 | 120 710 0 
3251 ih 2 ee O | 530 | 900 ipAriay, | 60 100 | 150 3 LS 6 
73255 b 2; \1.2 or 1-3) 530 900 2275 60 | 100 | 150 6 10 0O 
APOCHROMATIC OBJECT GLASSES. 
Approximate magnifying power. 
Add for each 20 m/m. 
KEngish | Focal | Numer. With eyepiece. extension of drawtube. 
No. designa- | length. | aper- 
tion. ture. x6. x8. Ls | eel: 72 x 25. 6s X'S hie G25: 
42 30 22) a5 10 42 30 22 15 10 
m/m.|m/m.|; m/m. | m/m. m/m. m/m.,m/m. m/m. m/m. m/m. 
inches. m/m. H Su sede 
3240 1} 40 “16 20 27 37 | 56 | 83 3 | 4 5 | 8 | 12 410 0 
3241 3 16 °35 62 90 120 175 270 i8 ll 15 | 23 30 715 0 
3241la x 14 +35 84 | 120 160 215 365 12 16 22 34 50 Te Alse 
3242 3 8 °65. | VSh| 155 220 325 500 20 26 35 | 60 75 9 10 0 
3244 4 4 -95 | 285 | 380 540 805 | 1225 40 53 165) VIOS\ T5041 10280 
§3245 A 4 95 | 285 | 380 540 805 | 1225 40 | 53 716° | 110") 150) }) 1127 10) 0 
*1+3247 L 3 1-2 | 380 | 500 725 | 1100 | 1500 50 75 90 | 140 | 200; 15 0 0O 
*+3250 + 2 Te? 530 | 705 | 1000 | 1505 | 2250 60 | 80) 110 | 170 | 250] 18 0 O 
*3248 + 2 1:3 530 | 705 | 1000 | 1505 | 2250 60 S05) ELO" | 170) F250) | StSaOe 0 
*3249 a 2 1-4 530 | 705 1000 | 1505 | 2250 60 80 | 110 | 170 | 250 | 25 0 0O 
*Oil immersion. **This object glass has a long working distance of 9 m/m. 
tincluding stop to reduce aperture to -95 N.A. 
§Provided with collar correction for using cover glasses of different thicknesses. 
SPECIAL OBJECT GLASSES. 
Monochromatic metallurgical object glass This object glass has a numerical aperture 
of 1°6 and is corrected for use with deep blue light. It is an immersion object glass, Mono- 
bromide of naphthalene being the fluid employed. 
Focus. Numerical aperture. 
No. 3674 aie 2°25 m/m. sag as = 1-6 us ee Prices on application. 
Monochromatic object glasses for ultra-violet light. This series are for use with light 
of a wave length 2756 A.U. The 6 m/m. is a dry lens the 3 mm. and 2 m/m. being used in 
immersion, the fluid used is a mixture of glycerine and water. 
Focus. Numerical aperture. 
No. 3675 ae, 6 m/m. a. if 0:07 ) 
No. 3676 bs 3 m/m. (immersion) ... A ay sae ... Prices on application. 
No, 3677 ae 2m/m. (immersion) ... aS 123°) 
Monochromatic object glasses for me‘allurgy with ultra-violet light. These are 
similar to the above but corrected for use with a vertical illuminator and uncovered objects. 
Focus. Numerical aperture. 
No. 3678 aoe 16 m/m. arr side 0°25 | 
No. 3679 oe 6 m/m. nee as 0°70 Prices on application. 
No. 3682 se 2 m/m. (immersion) 1-4 
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