Grain Reticle - Nikon Epiphot 300 Manual

13. Grain Reticle

• Insert the grain reticle slider into the scale port. Adjust its position in the direction in
which it slides until the pattern is located in the center of the viewfield.
• Following two reticles are contained in the slider:
• Austenite reticle (for measuring the grain size of steel austenite)
Compare the sample with the eight reticle patters numbered G) to
Use the lOx objective to obtain the grain size. When using the 20x objective, read the
pattern second to the next high numbered one. When using the 5x objective, read the
pattern second to the next low numbered one.
• Grid (for testing non-ferrous inclusion)
This grid can be used as a simplified length scale. It has 20 vertical and 20 horizontal
lines. The spacing between any two vertical or horizontal lines is 0.5 mm on the reticle
surface. This spacing, when viewed through the binocular eyepieces with the 1 Ox
objective in the optical path, represents 0.05 mm on the specimen surface.
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: • When inserting the reticle slider into its port, face its side with the
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indications toward the front of the microscope.
: • The.reticle image is not visible through the side port.
I • Reticle patterns may not be clearly visible on a dark background as
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in the case of darkfield microscopy.
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