Vol 2 Iss. 4

Amphibole. Pyroxene. Aegirine. Enstatite. Hyper wall. Babingtonite. Lievrit (ilvait). Beryl. Phenakite. He's scared. Willemite. Sphene (titanite). Parisite. Gold. Cerussite. Aragonite. Quartz. Olivine. Neptunite. Cinnabar. Celestine. Barite. For a detailed description of the crystals, see the article.

Дается алгебраическое уравнение F(x,y) = 0, mu степени относительно х и nu степени относительно у. Требуется х и у заменить новыми количествами ɛ и ɳ посредством уравнений. ɛ = j(х,у), ɳ = f(x,y), j и f рациональные функции. За немногими исключениями, которые должны быть в каждом частном случае предметом особого исследования, преобразование (2) будет бирационально. Осуществить это преобразование посредством рациональных действий можно следующими образом. Рассмотрим способ приведения гиперэлиптического интеграла.

Кобальти-амин-хлоро-диметил-глиоксимин был впервые получен Л, А. Чугаевым, предложившим его одному из авторов для кристаллографического исследования. Кристаллизация производилась при температуре около + 20°С. из растворов в воде с 5% содержанием уксусной кислоты. В этом растворителе исследуемое соединение растворимо на холоде довольно трудно, причем растворимость его при нагревании повышается. Порошок вещества, взятый в избытке, нагре­вался в растворителе на водяной бане приблизительно до температуры кипения; затем горячий раствор отфильтровывался и охлаждался при комнатной температуре (около + 20° С). Результаты исследований см. в статье.

With the slow crystallization of cobalti - amine - chloro - dimethyl - glucosimine at + 18-20 ° C, special, mysterious facets appear on some crystals of this compound. These faces differ primarily in their size, since they are usually larger than others and formed so perfectly that when measuring, you can guarantee accuracy of up to a few seconds. However, by their position they do not seem to belong to the crystal complex, as their symbols are extraordinarily complex, almost irrational.

Let's imagine a crystal measured on a universal, theodolite goniometer. Let's assume that we have to measure a face that has various defects in formation and gives not one but several signals (due to the development of vicinaloids). Under such conditions, the measurement accuracy is significantly reduced and rather large errors can be made in the calculations of the angles φ (along the vertical limb of the goniometer) and p (along the horizontal limb). Even if the edge is formed well enough, it is still often possible to vouch for the accuracy of only a few minutes, and greater accuracy is achieved only in exceptional cases.

In G. I.'s notes on page 259 on the compilation of tables for crystal chemical analysis, some statistical data on this subject were already given, although these data were based on less material than is currently available to me. A major step has now been taken to compile these tables, namely, 3,730 diagrams have been compiled based on the material contained in 42 volumes of the Zeiteschrift für Krystallographie, both in its original articles and in abstracts (several hundred of these diagrams have already been checked by the staff and thus their settings, and therefore their place in the tables, are fixed).

Currently, crystallography widely uses graphic techniques to solve its problems. Increasing accuracy is also one of the goals set in the development of graphical operations. As for the design of the new device, we mainly note the much larger dimensions of the device, of which the black hemisphere, as the main working part of the device, has a diameter of about a yard. The second device is a universal touch goniometer with three axes. It is used for ordinary measurement using the universal method of crystals so large that they can no longer be mounted on the crystal carrier of ordinary goniometers. The third device is designed to facilitate the crystallization process. The principle of operation consists in rhythmic heating and cooling of a vessel with a solution in which crystallization occurs.