LABORATORY INSTRUMENTS FOR RESEARCH
ABBE TYPE REFRECTOMETER
examination of liquids open the prism box and place a
few drops upon the ground surface of the lower prism.
Close and fasten the prism box when the liquid will be
squeezed into a thin film between the prism.
the crosswire with the eyepiece, adjust the mirror until
the illumination is good, and gently turn the prism box
by means of a milled head screw forwards and backwards
until a coloured band appears in he field of view. By
turning the milled ring at the base of the telescope,
a position will be found at which the coloured band will
be ellminated, the field of view being partly light and
partly dark with a sharp dividing line.
this sharp dividing line into coincidence with the intersection
of the crosswires and read the refractive index or sugar
percentage on the divided arc by means of the magnifier.
scale is divided to the third decimal place, the fourth
being easily oriented by estimation. It will be noted
that the hing of the prism box is so constructed that
the lower prism in the box may be removed.
examination of plastic bodies such as resin, remove the
lower prism box, soften the material by heat, and smear
a little on the exposed surface of the upper prism, then
proced as above. To examine crystals or glasses. When
the correct quantity is used, the specimen will adhere
firmly to the prism face.
should be prepared, similar in shape to the standard glass
test piece provided. Moisten the polished surface of the
specimen with the smallest possible quantity of monobromonapthalene
and place it upon the suface of the prism with the ground
edge directed towards the mirror. Care must be taken to
avoid excess of monobromonathalne as this may spoil the
definition and confuse the reading.
is sent out carefully adjusted, but it is as well to verify
the setting by applying the class test piece to the prism
and nothing if the reading is that marked on the piece.
is not the case, adjust the small squared screw at the
back of the telescope with the key provided until agreement
is secured. The mean of several reading should be taken
if great accuracy is desired.
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