A PLATINUM CRUCIBLE FOR CARBON COMBUSTIONS.

E. Heyn determined the melting points of mixtures of copper and cuprous oxide of compositions varying between 100 per cent. Cu and 88·24 per cent. Cu, 11·76 per cent. Cu 2 O. The results of his experiments are shown by the points marked + in fig. 1. These points fall on two curves intersecting at the eutectic point 1065° C., Cu 2 O 3·5 per cent., Cu 96·5 per cent. Heyn found that all his mixtures showed a halt in the cooling curve at this eutectic temperature, so that within the range of his experiments there is no evidence of the existence of solid solutions. C. N. Otin has lately published some experiments on the melting points of the system cuprous oxide-silica. He attempted to determine the melting point of cuprous oxide, but as some oxidation always took place in his experiments, and as he did not analyse the solid obtained (on account of having to remelt it to get it out of the platinum crucible), there is some doubt as to the actual composition of the substance of which he determined the melting point. The highest temperature at which he found a halt in the cooling curve was 1205° C.

Note on Carbon Combustion in a Platinum Crucible.

Journal of the American Chemical Society ◽

10.1021/ja02011a019 ◽

1903 ◽

Vol 25 (9) ◽

pp. 997-999 ◽

Cited By ~ 1

Author(s):

Porter W. Shimer

Keyword(s):

Platinum Crucible ◽

Carbon Combustion

III. On a New Combustible Gas

Transactions of the Royal Society of Edinburgh ◽

10.1017/s0080456800021827 ◽

1828 ◽

Vol 11 (1) ◽

pp. 15-22

Author(s):

Thomas Thomson

Keyword(s):

Acetic Acid ◽

Specific Gravity ◽

Good Deal ◽

Platinum Crucible ◽

Combustible Gas

It has been generally known for several years, that, when the acetic acid formed by the distillation of wood is rectified, there is obtained a transparent spirituous liquor, analogous in many respects to alcohol, though very different in others. This liquid has received the name of pyroxylic spirit. It is manufactured by Messrs Turnbull and Ramsay of Glasgow. I have been in the habit for several years of employing it for combustion in lamps instead of alcohol. It is a good deal cheaper, and raises just as good a heat as alcohol; for I can make the small platinum crucible, which I use for drying the products of analysis, red-hot by means of a pyroxylic spirit lamp in a few minutes.Pyroxylic spirit is as limpid and colourless as alcohol. Its specific gravity, when well rectified, is 0.812. It has an agreeable smell, not, however, quite free from that of naphtha. Its taste is very disagreeable, owing, I believe, to a small portion of naphtha, or empyreumatic oil, which it holds in solution, and from which we cannot free it by any known process. A set of experiments on pyroxylic spirit by Messrs Macaire and Marcet was published in the Bibliotheque Universelle for October 1823. These gentlemen have described several of its properties, and subjected it to an analysis, from which it appears that, like alcohol, it is composed of hydrogen, carbon and oxygen, though the atomic proportions are different.

Analyzing Ferrosilicon without a Platinum Crucible

Scientific American ◽

10.1038/scientificamerican11031917-279csupp ◽

1917 ◽

Vol 84 (2183supp) ◽

pp. 279-279

Keyword(s):

Platinum Crucible

Fabrication of Sn-doped zinc phosphate glass using a platinum crucible

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2011.09.025 ◽

2012 ◽

Vol 358 (2) ◽

pp. 265-269 ◽

Cited By ~ 38

Author(s):

Hirokazu Masai ◽

Toshiro Tanimoto ◽

Takumi Fujiwara ◽

Syuji Matsumoto ◽

Yoshihiro Takahashi ◽

...

Keyword(s):

Phosphate Glass ◽

Zinc Phosphate ◽

Platinum Crucible ◽

Zinc Phosphate Glass

Fabrication of low-loss titanium-diffused LiNbO3 waveguides using a closed platinum crucible

Electronics Letters ◽

10.1049/el:19870825 ◽

1987 ◽

Vol 23 (22) ◽

pp. 1187 ◽

Cited By ~ 12

Author(s):

A. Never ◽

T. Pohlmann

Keyword(s):

Low Loss ◽

Platinum Crucible

Ba3Y2Cu2PtO10: Newly Obtained Phase During Single Crystal Growth of Ba2YCu3O7-δfrom Platinum Crucible

Japanese Journal of Applied Physics ◽

10.1143/jjap.28.l63 ◽

1989 ◽

Vol 28 (Part 2, No. 1) ◽

pp. L63-L66 ◽

Cited By ~ 10

Author(s):

Taketoshi Hibiya ◽

Yukinobu Nakabayashi ◽

Tetsuro Satoh ◽

Tsutomu Kawamura

Keyword(s):

Crystal Growth ◽

Single Crystal ◽

Single Crystal Growth ◽

Platinum Crucible

IV.—Note on a Perforated Silica Plate for excluding Flame Gases from a Crucible during Ignition

Proceedings of the Royal Society of Edinburgh ◽

10.1017/s0370164600012748 ◽

1913 ◽

Vol 32 ◽

pp. 17-18

Author(s):

Alexander Charles Cumming

Keyword(s):

Calcium Carbonate ◽

Nickel Oxide ◽

Chemistry Department ◽

Bunsen Burner ◽

Platinum Crucible ◽

Porcelain Crucible ◽

University Of Edinburgh ◽

The University

The device shown in the accompanying sketch has been in use in the Chemistry Department of the University of Edinburgh for some time. It consists of a silica plate, 5 inches square, with a hole bored in it of such size as to admit a crucible to one-half of its depth. The silica plate is held in an inclined position by a clamp.By this means the flame gases are excluded from the interior of the crucible during an ignition. With this device calcium carbonate in a platinum crucible is quickly reduced to oxide with a good bunsen burner, while with a Mecker burner the reduction is complete in a few minutes even when a porcelain crucible is used. The device is also useful for cases such as the ignition of nickel oxide, where there is a danger of reduction. For the estimation of sulphur in coal some such device is absolutely necessary to exclude the flame gases.

The Electrolysis of Potassium-Ethyl Malonate and of Potassium-Ethyl Succinate

Proceedings of the Royal Society of Edinburgh ◽

10.1017/s0370164600006696 ◽

1891 ◽

Vol 17 ◽

pp. 54-56

Author(s):

Crum Brown ◽

James Walker

Keyword(s):

Succinic Acid ◽

Electromotive Force ◽

Cold Water ◽

Platinum Wire ◽

Platinum Crucible ◽

Ethyl Malonate

(Abstract)Synthesis of Succinic Acid.—Potassium-ethyl malonate is easily prepared according to the directions of Freund (Berichte der deut chem. Gesellschaft, xvii. 780).The conditions most favourable for the electrolysis were found to be as follows :—A large platinum crucible formed the cathode, while a spiral of stout platinum wire was used as the anode. The source of electricity was a battery of accumulators, and the current was so regulated that while passing through the solution it had an electromotive force of 12 volts and a strength of not more than 5 ampères. Under these circumstances the heat developed in the solution could be easily conducted away by a stream of cold water flowing round the platinum crucible.

A Quantitative Method for Estimating the Periodicity of Diatoms

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400023535 ◽

1949 ◽

Vol 28 (3) ◽

pp. 713-717 ◽

Cited By ~ 6

Author(s):

Anwar Abdel Aleem

Keyword(s):

Nitric Acid ◽

Quantitative Method ◽

Dry Weight ◽

Soluble Form ◽

Distilled Water ◽

Considerable Time ◽

Marine Diatoms ◽

Platinum Crucible ◽

Sand Particles ◽

Diatom Silica

The method described below was evolved as a substitute for counting, which is unsatisfactory for epiphytic marine diatoms. It depends upon the estimation of the amount of diatom-silica associated with unit dry weight of the sub-stratum. The sea-weed samples are first freed from sand particles and are then treated with strong nitric acid in the usual way. In order to convert the insoluble silica of the diatoms into a soluble form suitable for chemical estimation, the material is fused in a platinum crucible with a mixture of K2CO3 and Na2CO3 and the fused mass is dissolved in (silica-free) distilled water and filtered. The amount of silica in the filtrate is determined colorimetrically according to the method of Dienért and Wandenbulcke (cf. Atkins, 1926). The method is simple in practice and saves considerable time and labour. The full procedure is illustrated by reference to a study of the periodicity of Grammatophora marina (Lyngb.) Kütz. at Swanage, Dorset.This species (PL. I) is found all the year round on Cladophora rupestris in a pit in one of the reefs at Peverel Point, Swanage. In summer it is the only epiphytic diatom on the Cladophora, while in spring and autumn small numbers of other epiphytes (Cocconeis, Opephora, Rhoicosphenia) are present. In order to obtain a fairly representative picture of the abundance of Grammatophora at different times, samples of the Cladophora were collected monthly from a definite area in the pit, each including 3–4 cm. of the apices of five to ten Cladophora tufts cut at random.