898 suiniARY OF current researches relatin-g to 



the twelve slides carried by the stage can have three different objects 

 mounted upon them. If then the centre object on one of the slides 

 is brought into the field of view, all those which occupy the same 

 relative position on the other slides will pass under the objective 



Fig 160. 



when the stage is rotated. On turning the milled heads above the 

 statue, the pinions connected with which work in rackwork attached 

 to the stage, the latter is moved from back to front or vice versa so 

 that the body-tube will stand over the first or third object on one of 

 the slides. The rotation of the stage will then bring the corre- 



