NE29 eyepiece reticles, whipple grid

Whipple Grid - NE29Originally designed for water particle analysis, but may be used for other aspects of particle counting. Grid shown: Ratio of full square to smallest is 50:1. Area is 2500:1.ReferenceMicroscopy of Drinking Water.PatternDescriptionDiameterProductNE29Whipple grid 100 squares in 7mm area.Surface chrome image.16mmEMS68009-1619mmEMS68009-1920.4mmEMS68009-20.421mmEMS68009-21
Whipple Grid - NE29

Originally designed for water particle analysis, but may be used for other aspects of particle counting. Grid shown: Ratio of full square to smallest is 50:1. Area is 2500:1.

Reference

  • Microscopy of Drinking Water.
Pattern Description Diameter Product
NE29 Whipple grid 100 squares in 7mm area.
Surface chrome image.
16mm EMS68009-16
19mm EMS68009-19
20.4mm EMS68009-20.4
21mm EMS68009-21
23mm EMS68009-23
24.5mm EMS68009-24.5
25mm EMS68009-25
26mm EMS68009-26
27mm EMS68009-27

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 may 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 graticule (NE57) only the smaller particles 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.
Code Title Size Pack Size Availability Price Updated: 20-04-2024
EMS68009-16 NE29 eyepiece reticles, whipple grid 16mm Each See above $224.00 AUD
EMS68009-19 NE29 eyepiece reticles, whipple grid 19mm Each See above $224.00 AUD
EMS68009-20.4 NE29 eyepiece reticles, whipple grid 20.4mm Each See above $224.00 AUD
EMS68009-21 NE29 eyepiece reticles, whipple grid 21mm Each See above $224.00 AUD
EMS68009-23 NE29 eyepiece reticles, whipple grid 23mm Each See above $224.00 AUD
EMS68009-24.5 NE29 eyepiece reticles, whipple grid 24.5mm Each See above $224.00 AUD
EMS68009-25 NE29 eyepiece reticles, whipple grid 25mm Each See above $224.00 AUD
EMS68009-26 NE29 eyepiece reticles, whipple grid 26mm Each See above $224.00 AUD
EMS68009-27 NE29 eyepiece reticles, whipple grid 27mm Each See above $224.00 AUD