Graticules, Stage Micrometers, and Calibration Standards
Eyepiece Graticules (continued) F. Specialist Designs
Spray Droplet Sizing Reticle (Matthews) — NG 30
For size and distribution assessments of aersol droplets. Used in conjunction with a 40X Microscope for direct measurements of droplets from 50-400 micron diameters. The actual pattern sizes are 50, 100, 200, and 400 microns. W.H.O. (Details on Request) and G.A. Matthews. Imperial College.
Pattern NG30
Description Matthews Spray Droplet Dia.
16mm 19mm 21mm 23mm Custom
Thompson — G23
For counting particles in any of three areas of known size. The graticule is calibrated in the same manner as a normal eyepiece scale. The result is then used to calculate the area of any square.
Pattern G23
Description Thompson for dust analysis
10mm, 7mm, and 4mm squares. Glass sandwich.
Chalkley Point Array — NG52
This is used to quickly determine the relationship of components to each other using random sampling. Curtis gives an example of its application, where a researcher may want to see whether or not a certain drug affects the volume proportion of cell types in a given organ. With this graticule the proportion of points lying over the image of one type of component is statistically proportional to the area occupied by that component. The 25 points of the array are placed over the field of view at random, so that a comparison can be made between the number of points touching the one type of component, with number touching the other type of component in each viewing. A series of observations will yield an increasingly accurate ratio of the comparative incidence of each type of particle.
Reference: A.S.C. Curtis. Medical and Biological Illustration, Vol. 10. pp 261-266. “Area and Volume Measurements by Random Sampling Methods.”
Pattern NG52
Description
Chalkley point array. Surface chrome image.
Dia.
16mm 19mm 21mm
Cat.#
68034-16 68034-19 68034-21
Dia.
16mm 19mm 21mm
Cat.#
68090-16 68090-19 68090-21
Cat.#
68003-16 68003-19 68003-21 68003-23 68003-50
Fax (215) 412-8450 or 8452 • email :
info@emsdiasum.com or
stacie@ems-secure.com •
www.emsdiasum.com Electron Microscopy Sciences In PA: (215) 412-8400 • Toll-Free (800) 523-5874
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