. Beck microscopes. Microscopes. =™.,n5^ No. 3260 No. 3261 No. 3262 No. 3798 No. 3253 No. 3254 No. 3255 No. 3263 No. 3264 Focal Length. 42 m/m. 25 „ 17 „ 10 „ 42 „ 25 „ 17 ,, Magnifying Power X 6 XlO Xl5 X25 X 6 XlO Xl5 25 ,, with indicator x 10 Eyepiece Nos. 3260 to 3262, with cross lines ^0 12 0 0 12 0 0 12 0 0 18 0 2 5 0 2 5 0 2 5 0 0 17 0 0 17 0 Compensating eyepieces. These eyepieces are specially corrected for use with apochromatic object glasses and should always be used with them to obtain full advantage of the corrections of these object gla ses. Focal length. Magnifying power. No. 32
. Beck microscopes. Microscopes. =™.,n5^ No. 3260 No. 3261 No. 3262 No. 3798 No. 3253 No. 3254 No. 3255 No. 3263 No. 3264 Focal Length. 42 m/m. 25 „ 17 „ 10 „ 42 „ 25 „ 17 ,, Magnifying Power X 6 XlO Xl5 X25 X 6 XlO Xl5 25 ,, with indicator x 10 Eyepiece Nos. 3260 to 3262, with cross lines ^0 12 0 0 12 0 0 12 0 0 18 0 2 5 0 2 5 0 2 5 0 0 17 0 0 17 0 Compensating eyepieces. These eyepieces are specially corrected for use with apochromatic object glasses and should always be used with them to obtain full advantage of the corrections of these object gla ses. Focal length. Magnifying power. No. 3266 45 m/ 'm No. 3267 30 „ No. 3268 22 , No. 3269 15 , No. 3270 10 .. No. 3270b 7 , No. 3270a 5 , No. 3270c 01 X 6 /2 2 0 X 8 2 2 0 X 11 2 10 0 X 17 2 10 0 X 25 2 10 0 X 37 3 3 0 X 50 3 3 0 xlOO 4 4 0 Projection eyepieces. These are specially corrected for photomicrography and projection and give a flatter field than the lower power Huyghenian and compensating eyepieces. Focal length. Magnifying power. No. 3685 42 m/m X 6 £2 2 0 No. 3686 XlO 2 10 0 Wide field eyepieces. These eyepieces give a field of view about 40% larger than either the Huyghenian or compensating eyepieces and are especially useful for searching. They also have an advantage for those who use spectacles in that the eyepoint is further away from the upper lens. Focal length. Magnifying power. No. 3773 25 m/m X10 £\ 15 0 No. 3774 21 „ Xl2 115 0 No. 3775 17 „ Xl5 1 15 0 No. 3778. Double demon- stration eyepiece . £8 15 0 In instructional work, an observer using a microscope fre- quently desires to show the object under examination to a second person and point out some feature which he wishes to demonstrate. This is difficult with the ordinary microscope, but with the double demonstration eyepiece two persons can observe an object at the same time. A movable pointer is provided which is visible in both fields, so that any particul part of the specimen can be indicated. The great assistance whic
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