CASSIAR ASBESTOS CORPORATION LIMITED CASSIAR MINE MEASUREMENT OF AIRBORNE ASBESTOS DUST | AT CASSIAR TABLE OF CONTENTS INTRODUCTION MEASUREMENTS OF AIRBORNE DUST BY MEMBRANE FILTER METHOD (a) SAMPLING TECHNIQUE | 1. Scope Apparatus Definitions Preparation ae Filter Unit Sampling Calibration of Personal Sampler ANALYSIS OF ASBESTOS SAMPLES BY OPTICAL PHASE CONTRAST MICROSCOPY Scope Apparatus: (i) Filter Mounting Equipment (ii) Optical Equipment (iii) Details of Cassiar Microscope Reagents Mount ing Pedeednees Optical System - Adjustment & Calibration: