82. C. G. DUNNING ON AN IMPROVED MICROSCOPICAL TURNTABLE, 



with the addition of a dovetail groove across the centre, in which 

 work the two sliding guides AA. To these guides are attached the 

 clips BB. One of the clips is fixed at right angles to its guide^ 

 the other being pivoted in order that it may adjust itself to any- 

 little irregularity which may occur from the edges of the slides 

 not being quite parallel. The ends of the guides are cut and 

 '' sprung," so as to give sufficient tension to secure a firm grip of 

 the slide ; this tension can, of course, be readily increased to com- 

 pensate for wear. Guiding lines and circles are ruled on the table 

 for the purpose of centering the slides, but, as will be readily seen, 

 any non-central position may be easily obtained even with slides up 

 to two inches in width, thus facilitating the application of the finish- 

 ing varnish to, or the repair of any slide, the covering glass of 

 which may not have been accurately centered. 



