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Walton Beckett Reticle
G22
Eyepiece Reticle with Walton/Beckett for Asbestos 3-1 Ratio. All with calibration factor of 4 for use with 40x objectives.
(16,19, 20.4. 21, 23, 24, 24.5, 25, 26, 27mm)
The Walton and Beckett graticule is used for counting fibrous dust (e.g. asbestos or glass fibres) and is particularly useful where the majority of fibres to be counted are shorter than 5 micron. The circle is divided into four by two diametrical lines scaled in units of 5 and 3 microns respectively. 3 and 5 microns are the critical measurements of fibre lengths used in fibre counting. Unlike the usual globes of other particle graticules the Walton and Beckett has a series of shapes to compare objects with. These shapes have been designed for comparison with fibres, especially since they incorporate an aspect ratio of 3:1 or 5:1 essential for such analysis.
- Line Thickness : 0.010mm +/-0.002mm
- Glass Type and Thickness : Soda Lime 1.5mm thick
- Overall Tolerance +/-0.003mm
- Diameter Tolerance +0/-0.1mm
Stage Micrometer
Line Thickness 0.002mm +0.001mm
Glass Type and Thickness B270 1mm thick
Scale Length Tolerance +/-0.001mm
Mount Black Anodised Aluminium Slide (76mm x 25mm x 1.5mm)
Divisional Marker Lengths 0.175mm, 0.125mm, 0.075mm OrientationCorrect on top surface
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