
1) Eyepiece grid 2) Eyepiece network 3) Graticule 4) It let Eric focus eyepiece 5) Network 6) Optical network 7) Optical reference grid 8) Reticule
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https://www.crosswordclues.com/clue/reticle

1) Graticule
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https://www.crosswordclues.com/clue/reticle

A reticle, or reticule ({ety|la|reticulum|net}), also known as a graticule ({ety|la|craticula|gridiron}), is a net of fine lines or fibers in the eyepiece of a sighting device, such as a telescope, a telescopic sight, a microscope, or the screen of an oscilloscope. Today, engraved lines or embedded fibers may be replaced by a computer-generated im...
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http://en.wikipedia.org/wiki/Reticle

set of intersecting wires used to facilitate accurate observations
Found on
http://phrontistery.info/r.html

Using two fine wires as part of a grid attached to part of the focal plane or a telescope eyepiece. This is used to locate the position and size of a celestial object.
Found on
http://planetfacts.org/space-terms/

• (n.) A small net. • (n.) A reticule. See Reticule, 2.
Found on
http://thinkexist.com/dictionary/meaning/reticle/

<microscopy> A group of lines, circles, angles, or some other pattern to be used as a measuring reference, as a focusing target, or to define a camera field of view. ... (05 Aug 1998) ...
Found on
http://www.encyclo.co.uk/local/20973
Ret'i·cle noun [ See
Reticule .]
1. A small net.
2. A reticule. See
Reticule , 2. [ R.]
Found on
http://www.encyclo.co.uk/webster/R/67

A matrix of dots, posts or lines, visible inside a rifle's telescopic sight, normally adjustable via exterior knobs for windage and elevation. After careful adjustment at a known range, the shooter aims the rifle by superimposing this matrix onto the target. With good estimation or range, cooperation from the wind, a clear eye and a steady hand, he...
Found on
http://www.hallowellco.com/abbrevia.htm

[
n] - a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument
Found on
http://www.webdictionary.co.uk/definition.php?query=reticle

reticle 1. A grid of fine lines in the focus of an optical instrument, used for determining the scale or position of what is being looked at. 2. Etymology: from Latin reticulum, 'little net'.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1838/
reticule 1 graticule noun a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.