Eyepiece Graticules
The standard size of the eyepiece Graticle is 16,19, and 21 mm. All other sizes are available on request.
A.
SIZE AND POSITION SCALES
Lines
and Crosses
Single
Lines - NE50
For measurement of large objects in conjunction with a graduated mechanical stage, and for alignment as well.
| Pattern | Description | Dia. | Catalog | Price | |
| NE50 | Single Line, nominal width 0.02mm. Image
covers entire field of view. Surface chrome image |
16mm | 67982-16 | 90.00 |  |
| 19mm | 67982-19 | 90.00 | |
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| 21mm | 67982-21 | 90.00 | |
Cross
Lines - NE8, NE81, NE82
Used as NE50 but for measurements in two directions and for sighting and alignment. Image covers the entire field of view.
| Pattern | Description | DIa. | Catalog | Price | |
| NE8 | Cross lines with surface chrome image. Nominal line width 0.020mm. | 16mm | 67983-01 | 90.00 | |
| 19mm | 67983-05 | 90.00 | |
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| 21mm | 67983-10 | 90.00 | |
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| NE81 | Cross lines with surface chrome image. Nominal line width 0.040mm. | 16mm | 67983-20 | 90.00 | |
| 19mm | 67983-25 | 90.00 | |
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| 21mm | 67983-30 | 90.00 | |
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| NE82 | Cross lines with surface chrome image. Nominal line width 0.0005mm. | 16mm | 67984-16 | 90.00 | |
| 19mm | 67984-19 | 90.00 | |
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| 21mm | 67984-21 | 90.00 | |
Broken
Crosslines - NE56
Used as above. Broken lines enable fine detail to beseen at the breaks. A thin boundary would be lost behind a a continuous line.
| Pattern | Description | DIa. | Catalog | Price | |
| NE56 | Broken cross lines. Image covers the
entire field of view. Surface chrome image. |
16mm | 67985-16 | 90.00 | |
| 19mm | 67985-19 | 90.00 | |
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| 21mm | 67985-21 | 90.00 | |
Crossed
Gauge Lines - NE53
Use as crossed lines, but for the measuring of distances between thelines. Greater accuracy can be obtained by locatng the specimen detail between the graticules gauge pair.
| Pattern | Description | DIa. | Catalog | Price | |
| NE53 | Two vertical lines 0.1mm apart with horizontal
line. Image covers the entire field of view. Surface chrome image. |
16mm | 67986-16 | 112.00 | |
| 19mm | 67986-19 | 112.00 | |
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| 21mm | 67986-21 | 112.00 | |
Horizontal & Vertical
Scales - NE1, NE2, NE5, NE20, NE28, NE31, NE41
These scales are used for the measuring of lengths of specimen or distances between points on a variety of different shaped objects. NE1scale showed: This eyepiece graticule has an overall length of 10.00mm with 100 subdivisions of 0.1mm. When used with a x10 objective each division will represent 10 microns on the specimen. By dividing the division of the chosen graticule by the magnification of the objective one obtains an approximate value that each division will represent on the stage.
| Pattern | Description | DIa. | Catalog | Price | |
| NE1 | Horizontal micrometer scale 10mm long with 0.1mm subdivions. Surface chrome image. | 16mm | 68010-16 | 91.00 | |
| 19mm | 68010-19 | 91.00 | |
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| 21mm | 68010-21 | 91.00 | |
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| NE2 | Vertical micrometer scale 10mm long with 0.1mm subdivions. Surface chrome image. | 16mm | 68006-16 | 106.00 | |
| 19mm | 68006-19 | 106.00 | |
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| 21mm | 68006-21 | 106.00 | |
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| NE5 | Horizontal micrometer scale 5mm long with 0.05mm subdivisions. Surface chrome image. | 16mm | 67988-16 | 106.00 | |
| 19mm | 67988-19 | 106.00 | |
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| 21mm | 67988-21 | 106.00 | |
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| NE20 | Horizontal scale 0.1 inch long with 100 subdivions. Surface scale image. | 16mm | 67987-16 | 106.00 | |
| 19mm | 67987-19 | 106.00 | |
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| 21mm | 67987-21 | 106.00 | |
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| NE28 | Horizontal micrometer scale. 1mm long with 100 subdivisions. Surface chrome image. | 16mm | 67992-16 | 112.00 | |
| 19mm | 67992-19 | 112.00 | |
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| 21mm | 67992-21 | 112.00 | |
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| NE41 | Horizontal micrometer scale 10mm long with 200 subdivisions. Surface chrome image. | 16mm | 67993-16 | 106.00 | |
| 19mm | 67993-19 | 106.00 | |
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| 21mm | 67993-21 | 106.00 | |
Crossed
Scales - NE17, NE18
Used as a horizontal and a vertical scale, they are especially useful when interested in measurement in different axis.
| Pattern | Description | DIa. | Catalog | Price | |
| NE17 | Crossed micrometer scales 10mm long with 0.1mm subdivions. Surface chrome image. | 16mm | 67989-16 | 112.00 | |
| 19mm | 67989-19 | 112.00 | |
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| 21mm | 67989-21 | 112.00 | |
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| NE18 | Crossed micrometer scales 5mm long with 0.05mm subdivions. Surface chrome image. | 16mm | 67994-16 | 112.00 | |
| 19mm | 67994-19 | 112.00 | |
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| 21mm | 67994-21 | 112.00 | |
Scales
with Crosslines - NE7, NE77
Used as a horizontal and a vertical scale, they are especially useful when interested in measurement in different axis.
| Pattern | Description | DIa. | Catalog | Price | |
| NE7 | Horizontal micrometer scale 10mm long with crosslines at 0.1mm spacing. Surface chrome image. | 16mm | 68013-16 | 106.00 | |
| 19mm | 68013-19 | 106.00 | |
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| 21mm | 68013-21 | 106.00 | |
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| NE77 | Horizontal micrometer scale 5mm long in 100 divisions with crosslines. Surface chrome image. | 16mm | 68012-16 | 106.00 | |
| 19mm | 68012-19 | 106.00 | |
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| 21mm | 68012-21 | 106.00 | |
Squares
and Grids
Note: These scales may need to be calibrated, according to intended use. There are a number of uses for the grids and squares listed and they will largely depend on the individual user's application.
EYEPIECE SCALES:
- Sectoring: A squared graticule might be used for the systematic examination of a specimen. Some of the squared patterns are numbered to aid in the identification of areas of interest. Sectioning is particularly useful for making drawings of specimens onto graph paper. The chess-board type of pattern helps the user to distinguish the position being examined: the darker squares are translucent, while the lighter ones are transparent, avoiding eyestrain in prolonged counting as many be necessary in hematology. These patterns provide the same advantages when used with image analysis and capture devices.
- Counting: A squared graticule can be used for counting. Here the basic principle is that a small area of the specimen is analyzed in order to obtain information about the total area. This minimizes wasteful work enabling simple analysis of a paricular area. An example of this would be the comparison of large to small particles in a specimen. By using the Miller craticule (NE57) only the smaller particules in the small square are counted, the result being multiplied by ten for comparison with the number of larger particles in the large square.
- Squared Grids: Squared grids can be used in particle size analysis as simple technical aids where sophisticated image analysis systems are not required. The areas of the particles to be measured can be estimated by simply counting the number of squares occupied by those particles. It is necessary to estimate fractions of a square or make a rule (e.g. count as a square all partly covered squares at the right and bottom sides of the grid, and ignore partly covered squares at the left and upper sides of the squares). This method would only be useful for a fairly crude estimation of a large diameter.
Squared
Grids - NE10, NE11, NE34
Simple grids are convenient for making sketches of the obseved speimen on graph paper. They are also useful for particle counting.
| Pattern | Description | DIa. | Catalog | Price | |
| NE10 | Grid (net) 0.5mm pitch. Surface chrome image. (Pitch: distance of center bar to center bar) | 16mm | 68011-16 | 106.00 | |
| 19mm | 68011-19 | 106.00 | |
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| 21mm | 68011-21 | 106.00 | |
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| NE11 | Grid (net) 1.00mm pitch. Surface chrome image. (Pitch: distance of center bar to center bar) | 16mm | 68015-16 | 106.00 | |
| 19mm | 68015-19 | 106.00 | |
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| 21mm | 68015-21 | 106.00 | |
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| NE34 | Grid (net) 0.1mm squares. Surface chrome image. | 16mm | 68018-16 | 112.00 | |
| 19mm | 68018-19 | 112.00 | |
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| 21mm | 68018-21 | 112.00 | |
Indexed
Grids - NE10A, NE11A, NE34A
Useful for particle counting, particularly when reference is needed between workers. Also, they are useful for area of specimen determinations.
| Pattern | Description | DIa. | Catalog | Price | |
| NE10A | Numbered grid5mm x 5mm. 0.5mm pitch. Marked 1-10 and A-J. Surface chrome image. | 16mm | 68011-16A | 106.00 | |
| 19mm | 68011-19A | 106.00 | |
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| 21mm | 68011-21A | 106.00 | |
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| NE11A | Numbered grid 10mm x 10mm. 1.0mm pitch. Marked 1-10 and A-J. Surface chrome image. | 16mm | 68016-16 | 90.00 | |
| 19mm | 68016-19 | 90.00 | |
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| 21mm | 68016-21 | 90.00 | |
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| NE34A | Numbered grid 1mm x 1mm. 0.1mm pitch. Marked 1-10 and A-J. Surface chrome image. | 16mm | 68018-16A | 112.00 | |
| 19mm | 68018-19A | 112.00 | |
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| 21mm | 68018-21A | 112.00 | |
Indexed
Grids - NE35
Useful for area of specimen determinations, especially rectangular shapes, also for particle counting.
| Pattern | Description | DIa. | Catalog | Price | |
| NE35 | Numbered grid 10mm x 10mm. 1mm indexed squares. Surface chrome image. | 16mm | 68014-16 | 112.00 | |
| 19mm | 68014-19 | 112.00 | |
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| 21mm | 68014-21 | 112.00 | |
Chessboard
Squares - NE15
The dark squares are translucent. Used as an alternative to simple grids for area of specimen determination and paricle counting. Alternative light and dark squares help to reduce eyestrain.
| Pattern | Description | DIa. | Catalog | Price | |
| NE15 | Chessboard (net) 2.0mm squares. Surface chrome image. | 16mm | 68008-16 | 218.00 | |
| 19mm | 68008-19 | 218.00 | |
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| 21mm | 68008-21 | 218.00 | |
Squares
- NE38
Combines three areas in one for convenience, giving area ratios A:B of 1:3 and B:C of 1:2.
| Pattern | Description | DIa. | Catalog | Price | |
| NE38 | Squares 10mm, 7mm & 4mm. Glass sandwich. | 16mm | 68017-16 | 112.00 | |
| 19mm | 68017-19 | 112.00 | |
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| 21mm | 68017-21 | 112.00 | |
Miller
Squares - NE57
The ratio of large to small squares is 9:1. Originally designed for hematology, they can be utilized for rapid counting of any evenly spread field of particle.
| Pattern | Description | DIa. | Catalog | Price | |
| NE57 | Miller 7x7mm grid. Glass sandwich. | 16mm | 68020-16 | 112.00 | |
| 19mm | 68020-19 | 112.00 | |
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| 21mm | 68020-21 | 112.00 | |
Whipple
Grid - NE29
Originally designed for water particle analysis, but may be used for other aspects of particle counting. Grid showed: Ratio of full square to smallest is 50:1. Area is 2500:1.
| Pattern | Description | DIa. | Catalog | Price | |
| NE29 | Whipple grid 100 squares in 7mm area. Surface chrome image. | 16mm | 68009-16 | 112.00 | |
| 19mm | 68009-19 | 112.00 | |
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| 21mm | 68009-21 | 112.00 | |
Gauges
Concentric
Circles - NE43, NE43, NE44, NE47
Can be used for two-way measurement when calibrated as a micrometer.
| Pattern | Description | DIa. | Catalog | Price | |
| NE42 | Concentric circle 0.25mm - 2.5mm diameter. 10 circles. Surface chrome image. | 16mm | 68019-16 | 112.00 | |
| 19mm | 68019-19 | 112.00 | |
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| 21mm | 68019-21 | 112.00 | |
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| NE43 | Concentric circle 0.5mm - 5mm diameter. 10 circles. Surface chrome image. | 16mm | 67997-16 | 112.00 | |
| 19mm | 67997-19 | 112.00 | |
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| 21mm | 67997-21 | 112.00 | |
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| NE44 | Concentric circle 1mm - 10mm diameter. 10 circles. Surface chrome image. | 16mm | 67998-16 | 112.00 | |
| 19mm | 67998-19 | 112.00 | |
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| 21mm | 67998-21 | 112.00 | |
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| NE47 | Concentric circle 2mm - 20mm diameter. 10 circles. Surface chrome image. | 16mm | 67999-16 | 112.00 | |
| 19mm | 67999-19 | 112.00 | |
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| 21mm | 67999-21 | 112.00 | |
Concentric
Circle - NE22
This design leaves the circle clear of obstruction. In addition the
intermediate lines are broken to improve
ease of reading.
| Pattern | Description | DIa. | Catalog | Price | |
| NE22 | Concentric circle 0.5mm - 12mm diameter. 24 circles. Surface chrome image. | 16mm | 68000-16 | 112.00 | |
| 19mm | 68000-19 | 112.00 | |
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| 21mm | 68000-21 | 112.00 | |
Gauge
Pairs - NE19
Gauge pairs occupying a field of view of 10mm. Each gauge is proportional
to its adjacent number. The
approximately size of the smallest pair = 0.1mm.
| Pattern | Description | DIa. | Catalog | Price | |
| NE19 | Gauge pairs. Surface chrome image. | 16mm | 68001-16 | 106.00 | |
| 19mm | 68001-19 | 106.00 | |
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| 21mm | 68001-21 | 106.00 | |
Full
Protractor - NE45
| Pattern | Description | DIa. | Catalog | Price | |
| NE45 | Full protractor scale 10mm diameter dividedin degrees. Surface chrome image. | 16mm | 68002-16 | 112.00 | |
| 19mm | 68002-19 | 112.00 | |
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| 21mm | 68002-21 | 112.00 | |
PARTICLE
SIZING AND DISTRIBUTING
The use of the eyepiece graticules showed in this section make it
possible to analyze specimens containing particles as an alternative,
or in addition to, sieving. Graticules for particle size analysis are
particularly popular when there are only limited quantities of particles
or where particles are smaller than 50 microns in diameter. Typical
substances analyzed are sand grains, soil particles, plant seeds, fertilizers,
abrasives, liquid droplets, pigments, pulverized coal, silica, fibers
and fine dust.
The basic principle employed is to compare particles to the globes and circles
of varying sizes that appear on the graticule – dark particles being
compared to solids globes, and light or transparent ones to the circles. Naturally
the procedure varies with the graticule concerned, more information about which
is given below.
Please note that for calibration the circles and globes will represent particles
smaller in diameter by the magnification of the objective.
Paterson
Globes and Circles - NG1
| Pattern | Description | DIa. | Catalog | Price | |
| NG1 | Paterson globes/circles. Surface chrome image. | 16mm | 68031-16 | 216.00 | |
| 19mm | 68031-19 | 216.00 |