Pumice stone is also exported from Lipari (II,oio tons in 1904).
Though, thanks to the overlaying porous pumice, the Taupo plateau is not fertile, it has a good rainfall and is drained by unfailing rivers running through deep terraced ravines.
Broken as is the surface, poor as is the soil of certain tracts, there is but little of the island which will not ultimately be cultivated with profit as pumice and clay-marl yield to labour.
For efficiency the operation must be conducted with small quantities; caking may be prevented by mixing the substance with sand or powdered pumice, or, better, with iron filings, which also renders the decomposition more regular by increasing the conductivity of the mass.
The dredge often brings up large numbers of nodules formed upon sharks' teeth, the ear-bones of whales or turtles or small fragments of pumice or other volcanic ejecta, and all more or less incrusted with manganese oxide until the nodules vary in size from that of a potato to that of a man's head.
In 1886 there was a serious volcanic eruption in the outlying island of Nivafoou, and at the same time Falcon Reef, normally awash at high water, discharged sufficient scoriae and pumice to form a new island 50 ft.
Soaps are also prepared in which large proportions of fine sharp sand, or of powdered pumice, are incorporated, and these substances, by their abrading action, powerfully assist the detergent influence of the soap on hands much begrimed by manufacturing operations.'
Millstones and pumice were also exported, but for the former the more gritty lava of Rocca Monfina was later on preferred.
The residual gas is then passed through a tube containing porous materials, such as woodor bone-charcoal, platinized pumice or spongy platinum, then mixed with steam and again forced through the tube.
Lava is much used for paving-stones in the neighborhood of volcanic districts, where pozzolana (for cement) and pumice stone are also important.
One of these he says is found in magnesia, is white in colour, does not attract iron and is like pumice stone.
The very extensive pumice deposits at Neuwied and the lava and other volcanic rocks belong to a more recent epoch.
According to an account of the natives, a violent eruption of Kilauea occurred in 1789, or about that time, and deposits of volcanic sand, large stones, sponge-like scoria (pumice) and ashes for miles around are evidence of such an eruption.
The islands have large (unworked) supplies of pumice, sandstone, sulphur, gypsum, alum and mineral-paint ochres, and some salt, kaolin and sal-ammoniac, but otherwise they are without mineral wealth other than lava rocks for building purposes.
They are mostly of volcanic origin, and include pumice, tufa, santorin earth, trass and pozzuolana itself.
of lava and pumice, with little distinction of strata, almost always confused and mingled together, and varying from spot to spot in degree of compactness.
This insulation generally consists of materials such as charcoal, silicate cotton, granulated cork, small pumice, hair-felt, sawdust, &c., held between layers of wood or brick, and forming a more or less heat-tight box.
Soc., 1895, 17, p. 187) manufactures it by passing the vapour of acetic acid through a rotating iron cylinder containing a mixture of pumice and precipitated barium carbonate, and kept at a temperature of from 500° C. to 600° C. The mixed vapours of acetone, acetic acid and water are then led through a condensing apparatus so that the acetic acid and water are first condensed, and then the acetone is condensed in a second vessel.
Lumps of manganese oxide, with a black, shining outer surface, are also characteristic of this deposit, and frequently encrust pieces of pumice or animal remains.
In the part of Herculaneum already excavated the corridors in the upper portions of the theatre are compactly filled, up to the head of the arches, with pozzolana and pumice transformed into tufa (which proves that the formation of this stone may take place in a comparatively short time).
Catania has a considerable export trade in sulphur, pumice stone, asphalt, oranges and lemons, almonds, filberts, cereals, wine (the total production of wine in the province amounted to 28,600,000 gallons in 1905) and oil.
The matter transported consisted of soil of various kinds - sand, ashes, fragments of lava, pozzolana and whitish pumice, enclosing grains of uncalcined lime, similar in every respect to those of Pompeii.
The lagoon is slowly filling up and becoming cultivable land, but the rate of recovery from the sea has been specially marked since the eruption of Krakatoa, the pumice from which was washed on to it in enormous quantity, so that the lagoon advanced its shores from 20 to 30 yards.
It was once generally supposed that the Pliocene epoch in Nebraska was distinguished by the activity of geysers; but the so-called geyserite " now known commonly and correctly as " natural pumice " and " volcanic ash," which is found in the Oligocene and later formations, has no connexion whatever with geysers, but is produced by the shattering of volcanic rock.
On the west of Mount Hekla this plain connects by a regular slope directly with the tableland, to the great injury of its inhabited districts, which are thus exposed to the clouds of pumice dust and driftsand that cover large areas of the interior.
of flake charcoal and vegetable silica, or II of small pumice, are required to give the same protection as 7 in.
In Australia and New Zealand pumice, which is found in enormous quantities in the latter country, takes the place of charcoal and silicate cotton.
Larger rounded lumps of pumice, found in the clay, have probably floated to their present situations, and sank when decomposed, all their cavities becoming filled with sea water.
The vegetation of Krakatoa was completely exterminated in 1883 by a thick coat of red-hot pumice.
Large areas are overlain with trachyte, basalt, obsidian, tuff and pumice.
Obsidians occur in many parts of the world along with rhyolites and pumice.
Minerals developed slightly, or not at all, are granite, valued at $1500 in 1905; surface salt, in the arid and semiarid regions; nickel and cobalt, in Lemhi county; tungsten, near Murray, Shoshone county; monazite and zircon, in certain sands; and some pumice.
Made from clay, ceramics or refractory concrete consisting of pumice or kiln burnt aggregate bonded with high alumina cement.
For information on pricing of DM modular block chimney system please visit our pumice chimney liners page.
Use face cloth, arm cloth, leg cloth, long loofah, wide loofah and pumice stone.
Works in two ways: 1) Each treat contains pumice which is found in human toothpaste.
pumice based with good quality top soil Large and flat with some trees & bushes.
Did the fallout of volcanic pumice and ash from Thera make life impossible for the Minoans?
Patches of white pumice often lie over the black sand, and when it is thick enough it is easily rideable.
pumice liner at Nant Rhys are planned for a work party in October.
pumice chimney liners page.
pumice stones on our feet!
pumice liner system.
Soc., 1895, 17, p. 187) manufactures it by passing the vapour of acetic acid through a rotating iron cylinder containing a mixture of pumice and precipitated barium carbonate, and kept at a temperature of from 500Ã‚° C. to 600Ã‚° C. The mixed vapours of acetone, acetic acid and water are then led through a condensing apparatus so that the acetic acid and water are first condensed, and then the acetone is condensed in a second vessel.
Land is river sand & pumice based with good quality top soil Large and flat with some trees & bushes.
Repairs to the chimney & fitting of pumice liner at Nant Rhys are planned for a work party in October.
Many of us carry stones for good fortune or for healing; we even use pumice stones on our feet !
You can also build a new chimney using a pumice liner system.
A crescent shaped iron leather- working knife has been found alongside pumice rubbers.
Other additives: Different recipes will call for different extras, but there are all sorts of additions that can be used in soap, from oatmeal to sea salt, pumice to poppy seeds.
Use a pumice stone or foot file to slough off calluses and tough spots on a regular basis.
The technician will use a pumice stick or stone to rub away thickened skin on the heels.
First, you exfoliate and then pumice the area so that it is tender.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.