The view generally held is that the ocelli are specially useful in dark places and for near vision; while the facetted eyes are for more distant sight and for the ascertainment of space-relations.
The facetted eyes of insects, in which a stippled image is formed, on the principle of mosaic vision.
There has been a good deal of discussion as to the relative functions of the ocelli and the facetted eyes of insects.
These facetted eyes, which are found in both insects and crustacea, have apparently a more complex structure than the ocelli.
The question is--Is each facetted organ an eye, or is it an aggregate of eyes?
With regard to these facetted eyes there has been much discussion.
If the facetted surface be cleared of its internal structures (the crystalline cones, etc.
The wheel was sometimes employed by the Romans to form a simple pattern by means of a series of polished ovoid depressions; when these are placed close together, the effect somewhat resembles that of our modern facetted glass.
The square bases with plinth-like steps belong to a much later time and are generally associated with facetted ware.
Some of his engravings are found upon goblets of flint glass with facetted stems, of English make, probably.
There is at South Kensington a small collection of the earlier facetted glass, presented by Mr. H.
For a hundred years the products of 'the mountain fringe of Bohemia' held the premier position, but towards the end of the eighteenth century this place was taken by the facetted flint-glass of England.
This it is that gives fire, but this fire is only fully brought out by means of facetted or angular surfaces.
The elongated handle striking a sharp acute angle adjacent to the edge of the broad facettedbody offers a inharmonious note.
A heavy glass bowl of cut glass with serrated rim and facetted ribs completes a grandiose piece representative of the period about 1825.
Here, in this candlestick illustrated, is an indication of facetted work as clean cut as glass, which in its working and in its technique is a metal too.
When completely facettedthe brilliant is finished and requires only to be cleaned, when it is ready for sale.
They are less expensive to cut than fully facetted stones and do not have the snappy brilliancy of the latter.
The rubbing down process does not leave a facetted surface, but only a coarse roughly rounded or flattened surface.
If almost any clear, colorless facetted stone is placed in the sunlight and a card held before it to receive the reflections, it will be seen that rainbow-like reflections appear on the card.
The sloping surface of the upper cone is facetted with thirty-two facets in the full cut brilliant, while the lower cone receives twenty-four.
Recently it has become common to polish the tops of colored stones with a smooth unfacetted, slightly convex surface, the back being facetted in either the brilliant or the step arrangement.
The pear-shaped brilliant is a facetted ball or drop, being a brilliant in style of cutting, although the form of the gem is elongated or drop-shaped.
The pollen bodies in the flower-dust of many flowering plants also often assume the form of facetted spheres.
Owing to these differences, eyes have been divided into simple and compound, and into facetted and non-facetted.
As already stated, the compound retina which characterizes the vertebrate lateral eyes is characteristic of all facetted eyes, and in the trilobites facetted lateral eyes are commonly found.
Johannes Mueller had pointed out in 1829 (Meckel's Archiv) that two kinds of eyes were found in the latter group, compound eyes with a smooth cornea, and compound eyes with a facetted coat.
Quenstedt's smooth andfacetted compound eyes the groups of simple eyes found in Harpes.
Males with facetted eyes and no ocelli Monophlebidæ.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "facetted" in a variety of sentences. We hope that you will now be able to make sentences using this word.
