It should not be heavily rolled copper, as the moreporous the metal the more easily will the mercury penetrate and amalgamate.
It was at first built of wood, but having been several times burned down, it was at length built of its present material--a porous stone full of animal remains, obtained from the bottom of the harbor.
The ashes, elms, hickories, and oaks may, on casual observation, appear to resemble one another on account of the pronounced zone of porous spring wood.
Looking thru the microscope at a cross-section of ash, a ring-porous wood, Fig.
Pores varying in size from large to minute; largest in spring wood, thereby giving sometimes the appearance of a ring-porous arrangement.
In diffuse porous woods, the main features to be noticed are: In the transverse section, Fig.
This arrangement would represent the diffuse-porous woods.
A few indistinctly ring-porous woods of Group II, D, and cedar elm may seem to belong here.
That would represent the ring-porous woods, and the large tubes would be called vessels, or tracheae.
Some diffuse-porous woods of groups A and B may seem to belong here.
It consists of a number of elements, which are formed of a porous diaphragm of a non-conducting material (in this instance plaster of Paris), which is impregnated with dilute sulphuric acid.
The porous part of the dome may be sandstone or limestone, and above this portion lie shales, which are the opposite of porous in texture.
Large and porous earthen pots of an oval shape, kept up by supporters, are filled with it.
In such case, the rubber is still in a highly porous condition, and it might be advanced that the heat of the smoke may help to maintain that condition.
If in a beaker of water there be placed a porous substance, such as animal charcoal, there is a great extension of the surface of the water, and a corresponding increase in the amount of compressed water.
They do not take kindly to loam, after having been grown in loose, porous soil, though many of them are strong enough to adapt themselves to ordinary garden conditions.
This rising ground was however well situated for our camp under present circumstances: it was composed of porous sandstone, which in these climates dries almost immediately after rain.
Two idols of porous basalt and numerous arrow-heads of obsidian are reported at Guautla, twenty-five or thirty miles north-west of Metlaltoyuca.
The material is a black porous volcanic stone, and the whole seems to form a cup, to which the head of the serpent served as a handle.
At Tlahuac, or Cuitlahuac, were seen two circular stones something over three feet in diameter and half as thick, of black porous volcanic material.
The ware is without glaze or slip or other surficial treatment save that the lamellar texture is best developed toward the surfaces; hence it is so porous that the filled vessel is moist even in the sun.
Ordinarily the nether fire-stick is of soft and porous wood, flotsam palm-wood and water-logged pine being preferred.
The subformations of the country being chiefly composed of sandstone and porous calcareous and siliceous rocks, renders the thin soils on these higher tracts extremely dry and arid.
A good deal of heavy rain usually falls about the autumnal equinox, but is quickly absorbed by the porous soil and prevailing arenaceous formations of the neighbourhood, consequently, the atmosphere is particularly free from humidity.
At la Tranchee this rock being barely covered, and where it happens to be so to any depth, by a porous loamy and gravelly deposit only,--this fact is peculiarly and very happily demonstrated by the healthiness of the place.
The houses along Red River were raised from the ground on piles, as the soil was too soft and porous for cellars.
The spongy soil is so porousthat the water, on which rests the thin layer of earth, appears as soon as a shallow excavation is attempted.
The largest of these glands--the parotid--may be seen as an elongated, porous swelling behind the eye.
The prominent eyes are greenish-yellow, and the longporous gland (parotid) behind the eye is smaller than in the Common Toad.
Should the battery be faulty, it will be well to renew the zincs and recharge the battery, if the porous cell be still in good condition; if not, new cells should be substituted for the old ones.
A zinc rod stands in one corner of the bottle, and is prevented from coming into actual contact with the porous cell by having an indiarubber ring slipped over its upper and lower extremities.
The Daniell cell consists essentially in a rod or plate of zinc immersed in dilute sulphuric acid, and separated from the copper or collecting plate by a porous earthen pot or cell.
The amalgamation of the zinc must be kept up by putting a small quantity of mercury in the porous cell.
Now this free hydrogen, by a series of molecular interchanges, is carried along until it passes through the porous cell, and finds itself in contact with the solution of copper sulphate.
Z is the zinc rod standing in the porous pot P, in which is placed the dilute sulphuric acid.
The "Fuller" cell consists in an outer glass or glazed earthern vessel, in which stands a porous pot.
The zinc is less acted on then, for when the bichromate solution diffuses into the porous pot, it obviously does so more at the bottom than at the top.
It is necessary to have an ounce or so of mercury in each porous cell, covering the foot of the zinc; or the zincs may be cast short, but of large diameter, hollowed out at the top to hold mercury, and suspended in the porous pot.
During the period of growth and root action, too much water at the root cannot easily be given, provided the material in which the plants are potted is sufficiently porous and the pots or Orchid pans have a sufficient drainage.
All light and porous bodies, such as hair, fur, wool, charcoal, and so on.
A porous cylinder was filled with warm water, and an agitator, driven by clockwork, kept the water in the cylinder at uniform temperature at any given moment.
A porous vessel is filled with water, the temperature of which is kept constantly at "blood heat" (98.
As wooden vats areporous and hence uncleanly they have to be constantly scrubbed and disinfected.
Spongy, porous roughstuff, deficient in resinous matter and weak in its binding property, is also often responsible for graining out.
It polishes down very close and compact as to texture, giving a glass-like, non-porous surface.
Porous under coats which absorb too great a percentage of the oil of the varnish cause deadening; and porous under coats, let us bear in mind, produce by far the larger share of varnish deadening.
The dry, porous timber absorbs enough wetness to raise the grain to such an extent that nothing short of a resurfacing will restore it to its normal smooth and perfect condition again.
Such a japan, too, should, when floated in a thin film over a glass or other strictly non-porous surface, dry firm and without brittleness in four hours.
Second, they show that ALL substances are porous to the ether.
It was carved from a mass of porous basalt, and made eleven feet eight inches in diameter.
This avenue was lined with some of the finest houses, built of a porous red stone dug from quarries in the neighborhood.
In the experiment on the decomposition of water by heat in porous tubes, the clay tube may be exchanged for a platinum one with advantage.
Steam from a retort or flask is passed through the tube D, into the inner porous tube T.
This phenomenon might be considered as a deviation from Gerhardt's law, but this would not be correct, because it may be shown by means of diffusion through porous substances, as described in Chapter II.
Porous or powdery substances are very prone to act in this way, especially spongy platinum and charcoal.
When the mass becomes hot, it boils, swells up, and solidifies, forming a porous mass very rich in alkali and capable of rapidly absorbing carbonic anhydride.
This basic salt forms the ordinary drug magnesia (magnesia alba), in the form of light porous lumps.
If the vapour of sal-ammoniac were not decomposed, it would pass through the porous mass as a whole, and the colour of the litmus paper would not be altered, because sal-ammoniac is a neutral salt.
The carbonic anhydride contained in air is absorbed by alkalis--best of all, soda-lime, which in a dry state in porous lumps absorbs it with exceeding rapidity and completeness.
Thus, by testing with litmus the substances passing through the porous mass, it may be decided whether the sal-ammoniac is decomposed or not when passing into vapour.
But it is best to take a solid porous alkaline mass such as soda-lime.
This property is found in animal protoplasmic membranes and in porous substances covered with an amorphous precipitate, such as is obtained by the action of copper sulphate on potassium ferrocyanide (Pfeffer, Traube).
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "porous" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: excretory; fine; penetrable; pervious; porous; runny; spongy; weepy
