engths, the equivalent and fringed with colour. The same effects are slightly single lens may be ascertained by substituting the observable at the edge of the field of view of an following formula for that previously given : ordinary compound eye-piece, and more so in the /I X/3 Ramsden than in the… … r;c 91 Fig. 83.— Mode of Fixing Eye-piece to secure cokeect Centring. — A, Section of Tubing ; B, Section of Wooden Ring ; C, Eye-piece ; D, Fixed Tubing for Eye-piece C. FiG. 89. — Ramsden Eye-piece simply mounted. Fig. 90. — Ramsden Eye-piece completely mounted. — A A, Lenses in B B, Brass…
Industrial arts · Handicraft
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