These are spindle shaped and have long processes.
Either (I) by the Mexican crusher or arrastra, in which the grinding is effected upon a bed of stone, over which heavy blocks of stone attached to cross arms are dragged by the rotation of the arms about a central spindle, or (2) by the Chilean mill or trapiche, also known as the edge-runner, where the grinding stones roll upon the floor, at the same time turning about a central upright - contrivances which are mainly used for the preparation of silver ores; but by far the largest proportion of the gold quartz of California, Australia and Africa is reduced by (3) the stamp mill, which is similar in principle to that used in Europe for the preparation of tin and other ores.
Here the two elements, ovum and yolk-cells, are surrounded by a shell of operculate or of spindle-capped types.
The spindle-muscle is seen overlying the rectum.
It is in fact the electromagnet and spindle of a telegraph relay with a siphon in place of the tongue.
The cytoplasm is largely concerned in the formation of spindle fibres and centrosomes, and such structures as the cell membrane, cilia, or flagella, the coenocentrum, nematoplasl~ or vibrioids and physodes are also products of its activity.
They are more easily seen, when the nucleus is about to undergo mitosis, at the ends of the spindle, where they form the centres towards which the radiating fibres in.
Coincident with these changes the nuclear membrane disappears and a spindle-shaped or barrelshaped group of threads makes its appearance in.
At each pole of this spindle figure there often occur fibres radiating in all directions into the cytoplasm, and sometimes a minute granular body, the centrosome, is also found there.
The spindle figure is probably the expression of forces which are set up in the cell for the purpose of causing the separation of the daughter chromosomes.
Hartog has endeavoured to show that it can only he formed by a dual force, analagous to that of magnetism, the spindle-fibi es being comparable to the lines of force in a magnetic field and possibly due to electrical differences in the cell.
The spindle arises partly from the cytoplasm, partly from the nucleus, or it may be derived entirely from the nucleusintranuclear spindleas occurs in many of the lower plants (Fungi, &c.).
The formation of the spindle begins in the prophases of division.
As division proceeds, the filamentous nature of this cytoplasm becomes more prominent and the threads begin either to converge towards the poles of the nucleus, to form a bipolar spindle, or may converge towards, or radiate from, several different points, to form a multipolar spindle.
The formation of the spindle differs in details in different plants.
F, Separation of the chromosomes into two groups G, Chromosomes grouped at opposite ends of the spindle to forn the daughter nuclei.
They are present from the beginning of the development of the cell-wail, and arise from the spindle fibres, all of which may be continued as connecting threads (endosperm of Tamus communis), or part of them may be overlaid by cellulose lamellae (endosperm of Lilium Martagon), or they may be all overlaid as in pollen mother-cells and pollen grains of Helleborus foetidus.
The ambiens muscle, long and spindle-shaped, lying immediately beneath the skin, extending from the pectineal process or ilio-pubic spine to the knee, is the most median of the muscles of the thigh.
4 the shoe H is secured to the taffrail, and the rotator in the water is hooked to the eye of the spindle M by the hook D.
Case A contains the wheelwork, and case E the spindle and steel ball FIG.
It represented the goddess, standing in the stiff archaic style, holding a spear in her right hand, in her left a distaff and spindle or a shield.
Dorsal papillae spindle-shaped or clubshaped.
After the division and cleavage of the chromosomes of the original nucleus have taken place they pass from the equator to the poles of the spindle, rearranging themselves close to the separated centrosomes to form daughter nuclei.
Present, that at one end of the spindle may be unusually large, the other of natural size, and they may vary in shape.
First they are round or oval in shape; later they become spindle shaped, arranging themselves in layers.
The "rod-and-disk" form of Sidney Young is a series of disks mounted on a central spindle and surrounded by a slightly wider tube.
This ring runs between friction wheels and is provided with teeth on its inner periphery, and these teeth transmit motion to a pinion on a spindle having at its other end another pinion which, through an intermediate wheel, rotates the heliometer tube.
All textile work was done by hand; the only devices known were the bark peeler and beater, the shredder, the flint-knife, the spindle, the rope-twister, the bodkin, the warp-beam and the most primitive harness.
Twining and spinning were done with the fingers of both hands, with the palm on the thigh, with the spindle and with the twister.
In Scott's sight, mark iv., there is a longitudinal level pivoted at one end and provided with a degree scale up to 4°; the level is moved by a spindle and micrometer screw reading to 2'.
The rocking-bar is moved by a rack g into which a pinion on a cross-spindle j gears; the cross-spindle is moved by means of a worm-wheel into which a worm on the longitudinal FIG.
Formerly Lowell was called the " Spindle City " and the " Manchester of America," but it was long ago surpassed in the manufacture of textiles by Fall River and New Bedford: in 1905 the value of the cotton product of Lowell, $19,340,925, was less than 60% of the value of cotton goods made at Fall River.
Harriet Hanson wrote Early Factory Labor in New England (1883) and Loom and Spindle (1898), an important contribution to the industrial and social history of Lowell.
Ermani), elder, poplar, elm, wild cherry (Prunus padus), Taxus baccata and several willows are mixed with the conifers; while farther south the maple, mountain ash and oak, as also the Japanese Panax ricinifolium, the Amur cork (Philodendron amurense), the spindle tree (Euonymus macropterus) and the vine (Vitis thunbergii) make their appearance.
The method once exclusively used consists in mixing the raw materials with a large quantity of water in a wash mill, a machine having radial horizontal arms driven from a central vertical spindle and carrying harrows which stir up and intermix any soft material placed in the pit in which the apparatus revolves.
He finds no spindle fibres or true chromosomes, and considers the division direct, not indirect.
Thread-Work.Stone spindle whorls (103) are common in the prehistoric age; wooden ones were usual, of a cylindrical form (104) ~n the XIIth, and conical (105) in the XVIIIth Dynasty.
The limbs of the U are further twisted together in a looser or tighter coil, the axis of which may be traversed by a "spindle" muscle arising from the posterior end of the body.
Euonymus europaeus - Spindle Viburnum - Guelder Rose, &c.
The exigencies of competition prompted the discovery that if yarn were sold by weight fresh from the spindle its comparative dryness made such early sale less profitable than if it were allowed to "condition."
Two or three slubbing rovings are put up behind the machine opposite each spindle; each end is guided separately into back rollers and thence between smaller rollers, known as carrier rollers, to the front rollers.
The product is wound on to the bobbin by means of flyer and spindle, and is known as dandied or fine roving, and is then ready for the spinning frame.