G24 Walton & Beckett 5:1 Pattern images provided for illustrative purposes only
Pattern

G24

Description

Walton & Beckett 5:1

Key features

Eyepiece Reticle with Walton/Beckett for Asbestos 5-1 Ratio. All with calibration factor of 4 for use with 40x objectives.

Options
Order code

G24

Price

£131.52 - £131.53

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1
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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

Orientation

Correct reading through glass