200 



Slips, Glass 49 



Slow Motion, 6 5 



Society Screw, 4 6 



Solid Eyepiece, JI 5 



Spectrum,. 2 4 



Spectrum, Secondary, 94, II2 



Spherical Aberration, 22, 96, 140 



Spring Clips, 4 8 



Stage 47, 53, 180 



Stage, Glass, 56, 181 



Stage, Micrometer, ...* J 7o 



Stage, Revolving, 55, l82 



Stage, Space Below, l8 



Stand 43, i?6 



Striae, TI 9 



Substage, 4 S > I2 



Substage ^Bar, 4 



Substage Condenser, J 54> l82 



TESTING OBJECTIVES, 95, 9^, 149 



Test Objects, J 3 2 



Test Objects, Which to Use i3 2 



Test Plate, " J 3 2 



Triple Nose-piece, 6 



Triplet, Hastings, 3Q, 3 



Triplet Lens, 3o, 3 



Tripod Magnifier, 3 2 



Triplet System, 8o 



Tube Length 50,78,176 



UNDER-CORRECTION, 95 



Universal Screw, 46 



VIRTUAL FOCUS, 20 



Virtual Image, 22 



WOLLASTON CAMERA LUCIDA, 164 



Water Immersion Objective, 8 5 



Working Distance, 



Working Distance, to Measure, I0 7 



