Eyepiece Graticules

Square Grids & Indexed Grids

• Square Grids - NE10, NE11, NE34

• Indexed Grids - NE10A, NE11A, NE34A, NE35

• Chessboard Squares - NE15

• Combined Squares - NE38

• Miller Squares - NE57

• Whipple grid- NE29

Square Grids-NE10, NE11, NE34

Simple grids are convenient for making sketches of the observed specimen on graph paper. They are also useful for particle counting. Surface chrome image

NE10 Grid (net) 0.5mm pitch

NE11 Grid (net) 1.0mm pitch. Surface chrome image
 

NE34 Grid (net) 0.1mm pitch. Surface chrome image
 

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Indexed Grids - NE10A, NE11A, NE34A

Useful for particle counting, particularly where a reference is needed between workers. This grid is also useful for area of specimen determinations.

NE10A Numbered grid 5mm x 5mm. 0.5mm pitch. Marked 1-10 and A-J. Surface chrome image.

NE11A Numbered grid 10 mm x 10 mm. 1.0 mm pitch. Marked 1-10 and A-J. Surface chrome image.

NE34A Numbered grid 1 mm x 1 mm. 0.1 mm pitch. Marked   1-10 and A-J. Surface chrome image.

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Indexed Grids - NE35

Useful for area of specimen determinations, especially for rectangular shapes. This grid is also useful for particle counting.
 

NE35 Numbered grid 10mm x 10mm, 1mm indexed squares. Surface chrome image.
 

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Chessboard Squares - NE15

The dark squares are translucent. Used as an alternative to simple grids for areas of specimen determination and particle counting. Alternate light and dark squares help to reduce eye strain.
 

NE15 Chessboard (net) 2.0mm squares. Surface chrome image.

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Squares - NE38

For convenience, three areas are combined in one. Gives area ratios A:B of 1:3 and B:C of 1:2
 

NE38 Squares 10mm, 7mm and 4mm Glass sandwich.

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Miller Squares - NE57

The ratio of large to small square is 9:1. Originally designed for hematology. they can be utilized for rapid counting of an evenly spread field of particles.

NE57 Miller 7 x 7 mm grid. Glass sandwich

References: American J.of Clinical Pathology.Vol.20.1950 page 1079 “Time saving Device for Counting Reticulocyte” G.Breschner and Schneiderman Practical Heamatology-J.D.Dacy.Published by J.A.Churchill.2nd Edition 1956 page 25

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Whipple Grid - NE29

The Whipple grid was originally designed for water particle analysis, but it may be used for other aspects of particle counting.

Grid shown: Ratio of full square to smallest is 50:1.

Area is 2500:1

NE29 Whipple grid, 100 squares in 7mm area.
Surface chrome image.

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Lines and Cross Lines  |  Square Grids & Indexed Grids  | Horizontal and Vertical Scales

| Concentric Circles |  Particle Sizing  |  Metallurgy |  Stereology  | Stage Micrometers

Stage Calibration Standards | Stage Volume counting