1050 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



streaks upon which the numbers stand. When the slide is pushed forwards 

 the toothed rod is disengaged from the wheel, and is replaced by another 



S 



simple arrangement not shown in the illustration. The cog-wheel e has 

 150 teeth, and as one complete turn raises the object 3/4 mm., one tooth 

 represents an ascent of 1/200 mm. 



