Results of Spirit Leveling in Illinois, 1896 to 1908, InclusiveU.S. Government Printing Office, 1910 - 74 páginas |
Términos y frases comunes
30 feet alkali alumina aluminum tablet stamped ammonia ammonium amount barium bench mark blast calcium cent Chem chloride cm.³ coal lands concrete post corner between secs corner fence corner of crossroads corner of sec County crucible determination detonators dilute east of track evaporated explosives feet east feet north feet south feet west fence corner filter filtrate fluorine front of station fuse gram hydrochloric acid hydrofluoric acid hydrogen hydrogen sulphide ignited Illinois Illinois Central Railroad iron post stamped Jour junction manganese method mile east milepost miles north miles northwest miles south miles west minerals nitrate nitric acid nitroglycerin north of fence north side northeast oxide platinum post stamped Prim powder precipitate QUADRANGLE quarter corner railroad road crossing rock side of road silica sodium carbonate solution south of road southeast southwest corner sulphate sulphide sulphuric acid THENCE titanium top of rail Trav tube vanadium weight west of fence zirconium
Pasajes populares
Página 4 - ... shall be required to prove their respective rights and pay for the lands filed upon within one year from the time prescribed for filing their respective claims; and upon failure to file the proper notice or to pay for the land within the required period, the same shall be subject to entry by any other qualified applicant.
Página 177 - CO2-free air with which to sweep out the apparatus before and after the experiment, and for a slow current during its continuance. The results are very accurate and the determination can be quickly carried out. The manipulations are as follows...
Página 185 - ... and tested for phosphorus by ammonium molybdate solution. If phosphate is absent the impurity may have been silica or calcium silicate — which of these it would be difficult to decide. In the former case the fluorine might be safely deduced from that of the sulphate, but not in the latter. If the rock were rich in sulphur it might happen that calcium sulphate would be thrown down with the fluoride, but this should be removed by thorough washing. If not, and it were certainly the only impurity...
Página 227 - The solution is then evaporated to dryness on the steam bath. It will do no harm with limestones low in magnesium to hasten dehydration of the silica by placing the dish with its dry contents in an air bath at an elevated temperature or on a triangle resting on a hot plate at 200° for an hour or less. 46. SILICA. The residue is treated with 5 to 10 cm.3 of strong hydrochloric acid, which is then diluted to half strength, or upon the residue may be poured at once a larger volume of acid of half strength....
Página 184 - N sodiumcarbonate solution is added to the filtrate, which is then boiled in a dish of good size with a large excess of calcium-chloride solution. At this stage there must be no ammoniacal salts in solution, otherwise calcium fluoride may be held up. The precipitate consists of a mixture of calcium carbonate and fluoride, the former serving to aid filtration of the latter. The precipitate is collected on paper and washed with hot water, dried, and ignited separately from the filter as far as possible.
Página 78 - When fusion is complete, as shown in the case of sodium-carbonate flux by the decided slackening of the gas current through the safety bulbs attached to the drying tube, the flame is extinguished and a current of air is allowed to continue until the apparatus is cold. This apparatus suffers from the drawback of being slightly permeable to combustion gases at high temperature. The defect can be overcome by causing the flame to play upon an outer ordinary platinum crucible, kept permanently filled...
Página 97 - The complete boiling off of this excess is unnecessary, as pointed out by Genth and Penfield, since it is apparently the washing with pure water and not the free ammonia which carries small amounts of alumina into the filtrate. SL...
Página 12 - The methods applied to their analysis differ in but unimportant respects from those used with the more siliceous rocks, since they are to a great extent themselves siliceous, contain essentially the same constituents, and therefore the same principles apply to both. Naturally they demand and receive briefer treatment. The special problems often arising in the analysis of rocks of extraterrestrial origin — the more or less stony meteorites — will not be considered here. An analysis of that kind...
Página 44 - After boiling in water, the substance is transferred with water to a small glass tube about 8 by 35 mm., provided with a fine platinum wire for suspension. This is weighed full of water in another vessel of water, and again after the removal of the mineral, the weight of which is found after drying. This method is, of course, more applicable to homogeneous minerals than to rock fragments, and will...
Página 171 - The sintered cake0 detaches readily from the crucible as a rule; if not, it is softened up in a few minutes by hot water and digested in a dish until thoroughly disintegrated. It is first washed by decantation, and any lumps are broken up by a pestle, then thrown on the filter and well washed with hot water. The residue should dissolve completely in hydrochloric acid without showing the least trace of unattacked mineral, not even of quartz, though sometimes a few black particles of iron ores will...