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Page Title: Figure 10-11. Lens Bench
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TM 9-254 10-10. Lens Bench - Continued Figure 10-11.  Lens Bench (1) The   lens   bench   contains   three   main   elements,   the   collimator   telescope,   the   nodal   slide,   and   the observing microscope, together with the bed on which they are mounted.   The  collimator  and  base  of nodal slide are permanently mounted on the bench, while the microscope is mounted on ways which are attached to the bench.  These are accurately machined and alined, along which the microscope may be moved.  The bench is equipped with a graduated scale, usually placed beneath one of the ways, while the microscope is equipped with an indicator and vernier scale so that its position can be determined to within 0.001 inch. (2) The collimator telescope is arranged to fulfill two functions.  One is to provide a suitable source of light, usually of parallel rays, and the other to provide a proper target. (3) The  nodal  slide  carries  an  adjustable  chuck  for  mounting  the  lens  under  observation.    The  chuck  is supported on the slide in such a way that it can be rotated on a vertical axis, and also can be moved longitudinally in a pair of short ways. 10-10

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