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ASBESTOS and OTHER FIBERS by PCM:METHOD 7400,Issue 2,dated 15 August 1994-Page 13 of 15 <br /> APPENDIX B.COMPARISON OF COUNTING RULES <br /> Figure 2 shows a Walton-Beckett graticule as seen through the microscope.The rules will be discussed <br /> as they apply to the labeled objects in the figure. <br /> 20x3 5 <br /> ' 3 � <br /> \0 <br /> 10x3 O <br /> O <br /> 20 <br /> 5x5/3 , O <br /> O <br /> 5 5 <br /> OO O 5 x 5/3 <br /> 9 Q <br /> O O <br /> ,O 10x3 <br /> 7 <br /> 3:1 ,O 3 <br /> 5 20x3 <br /> Figure 2.Walton-Beckett graticule with fibers. <br /> NIOSH Manual of Analytical Methods(NMAM),Fourth Edition <br />