896 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
division of the scale raising the object 1/5000 in. (-0002). It is 
obvions that the section is slightly wedge-shaped, but the amount is so 
extremely trifling, that expert section-cutters have informed the makers 
that they consider it immaterial. 
Mayer’s Section-stretcher. — The section-stretcher shown in fig. 109 
can in this new form be used on each side of the knife, and is easily 
fitted on the back. The long rod e is adjusted, partly by hand and 
partly by means of the screws /, so that it is parallel to the knife-blade 
