CĂRȚI ÎN ENGLEZĂ ÎN LEGĂTURĂ CU «DICHROISCOPE»
Descoperă întrebuințarea
dichroiscope în următoarea selecție bibliografică. Cărți în legătură cu
dichroiscope și extrase din aceasta pentru a furniza contextul de întrebuințare al acestuia în literatura Engleză.
1
From Satan's Crown to the Holy Grail: Emeralds in Myth, ...
Emeralds show a green primary body color with a bluish green secondary color.
Gemologists test for pleochroism with a dichroiscope. This simple
instrumentismadeofa pieceof Iceland spar, whichrather amazingly actuallycomes
from Iceland.
2
Precious stones and gems, their history, sources and ...
Gems belonging to the Cubic system of crystallization do not exhibit this property,
while in those belonging to any of the other systems this diversity may often be
detected, when properly examined by the dichroiscope, be the stone ever so ...
3
Journal of the Royal Microscopical Society
Sorby's Dichroiscope. — Dr. H. C. Sorby's dichroiscope (fig. 9), as mado by
Mossrs. Beck, consists of four parts : — (1) An A eye-piece, between the two
lenses of which slides a blackcnod brass plate with a circular aperture and a slit.
The width ...
4
The polarizing microscope
A more delicate method is by Haidinger's dichroiscope. This consists of a small
oblong diaphragm opening mounted with a calcite cleavage prism and lens as in
Fig. 8- la. The opening is placed against the crystal, which is examined in ...
Arthur Francis Hallimond,
1970
This effect can generally be appreciated by the naked eye, but can always be
detected by means of the dichroiscope. This little instrument consists of a metal
cylinder containing a cleavage rhombohedron of Iceland Spar, and possesses an
...
6
Journal of the Royal Microscopical Society
Gemmological Microscope and Dichroiscope.*—E. K. Spiegelhalter, in a paper
read before the National Association of Goldsmiths, discusses some of the
difficulties involved in distinguishing between true gems and gem copies,
especially ...
7
Chemical News and Journal of Industrial Science
When examined by the dichroiscope, trie light through the principal axis shows
one image of an azure blue, and the other of an emerald green. In reply to a
question by Mr. C. E. Groves, the author said he had not examined the light from
the ...
8
The treatise on metal mining: prepared for students of the ...
These patches of garnets are considered a good indication of the possible
presence of more valuable gems. THE DICHROISCOPE. 74. To settle the identity
of a stone, the dichroiscope (in shape a cylinder 2 inches long and 1 inch in
diameter, ...
International Correspondence Schools,
1899
9
Precious Stones and Gems: Their History, Sources and ...
The use of the instrument called the dichroiscope renders the distinction a matter
of certainty. This instrument enables us to see whether the gem possesses the
property of dichroism — that is, of exhibiting two distinct colours, or tints, when ...
Edwin William Streeter,
1898
10
A hand-book of precious stones
PLEIOCHROISM.image of the square opening when the cap is pulled out about \
of an inch. The pleiochroism of many stones can be determined at a glance with
the dichroiscope. When a stone is examined by means of the dichroiscope, it will
...