magnification:
(a) objective lens 40X
(Cb) adjustable magnifier 1.5X

(c) eye piece 10X

(d) total system 600x°

(base of viewing head fitted “with adjustable magnification
changer unit and a focusing bertrand lens)

illumination system: low voltage 6V1i8W illuminator with
field centrable field iris

type of graticule used: British standard graticule, defined
area at plane of focus is 75 x 53 micrometers

diameter of full field of view: 263 micrometers

REAGENTS

Mounting Solution:

Triacetin which is free of particles and colour is required.
Filter materials identical to that used in eenpiine is also

required.”

MOUNTING PROCEDURES

Sample Mounting:

Using the scalpel the exposed filter sample is carefully

sliced into the appropriate number of sectors ase required for analysis of

the sample. With a glass rod supplied with the Wheaton Balsam bottle, apply

a small drop of filtered mounting solution (Triacetin) to a cleaned glass

slide or the mounting solution may be dispensed through a solvent resistant
membrane filter held in a syringe filter holder. Filtration of the cleaning agent
is particularly important if asbestos contamination is possible, and if relatively .
low dust levels are to be meeaned. It is important to avoid using an :
excessive amount of solution so as to avoid migration of the asbestos particles.

With another clean glass rod, or use the tip of a syringe to spread spot

into circle, spread the spot. of mounting solution so that it coincides