It's what's symbolized by "X" in the "10X" on a microscope
[DOC] [TLE] Lens Lens Power Ring Color Total Magnification Unaided Eye ... [PAR] Lens Lens Power Ring Color Total Magnification Unaided Eye 1X none 1X x 1X 
... 10X none 1X x 10X = 10X Scanning 4X black 10X x 4X=40X Low Power 10X ... 
Parcentral Property of the microscope which keeps the specimen relatively ... 
2,200 m What is the relationship between the diameter of the field of view and 
its... [DOC] [TLE] Lentz Microscopy Collection - Yale School of Medicine [PAR] The history of histology in scientific investigation and the microscope slides .... 
medieval glass industry, its guild of crystal workers officially created in November