732 



SEC. 16. GEOLOGY AND MINING. 



47. Porphyrite. Goroblagodatsk, 

 Ural. 



48. Plagioclase-porphyry. Altai, Si- 

 beria. 



49. Augite-porphyry. Blagodat, 

 Ural. 



50. Uralite-porphyry. Katharinen- 

 burg, Ural. 



51. Oligoclase-diabasite porphyry. 

 Aiatsk, Ural. 



52. Felsitic-retinite (Kulibinite). 

 Nertchinsk, Siberia. 



53. Amorphic-trapp (Sordowalite). 

 Serdobol, Finland. 



54. Trachyte. Kasbek, Caucasus. 



55. Hornblendic-andesite. Koktebel, 

 Crimea. 



56. Augite-andesite. Kasbek, Cau- 

 casus. 



57. Andesitic-lava. Kasbek, Cau- 

 casus. 



58. Obsidian. Goktcha, Caucasus. 



59. Anamesite. Rowno, Volhynia. 



60. Basalt. Goktcha, Caucasus. 



61. Rock-salt. Iletzk, Orenburg. 



62. Marble. Gornoshitsk, Ural. 



63. Limestone. Sanarka, Ural. 



64. Oolite. Kamenka, Podolia. 



65. Ophiocalcite. Kussinsk, Ural. 



66. 67, 68. Doloinitic-marble. Tiv- 

 dia, Olonetz. 



69. Dolomitic-marble. Kapselga, 

 Olonetz. 



70. Magnesite. Poliakovsk, Ural. 



71. Porous quartz. Beresovsk, Ural. 



72. Lydite with anthracite. Isle 

 . Volk, Lake Onega. 



73. Hornstone with silver. Altai, 

 Siberia. 



74. Jasper. Lake Kalgan, Ural. 



75. Jasper. Poliakovsk, Ural. 



76. Magnetite. Blagodatsk, Ural. 



77. Specular-iron-schist. Krivoi-Rog, 

 Cherson. 



78. Spathose-iron. Satkinsk, Ural. 



79. Sphaerosiderite. Kromy, Orel. 



80. Chromite. Ural. 



81. Graphite. Tunkinsk, Siberia. 



82. Graphite. Tunguska, Siberia. 



83. Anthracite. Grushevka, Chain 

 of the Donetz. 



84. Coal. Chain of the Donetz. 



85. Coal. Regewsk, Ural. 



86. Coal. Tovarkova, Tula, 



87. Boghead-coal. Muraievna, Ria- 

 zan. 



88. let. Tkvibul, Caucasus. 



89. 90, 91. Sandstone. Shoksha, 

 Olonetz. 



92. Sandstone. Vytegra, Olonetz. 



93. Apatite-sandstone. Kursk. 



94. Apatite-sandstone. Tambof. 



95. Alumstone. Zaglic, Caucasus. 



II. MINING. 



3383. Ramsay's Water Gauge, for measuring the friction 

 of ventilating currents in mines or other places. 



D. P. Morison, New castle-on- Tyne. 



The india-rubber tube is connected with the return airway of the mine, 

 the other compartment of the apparatus being in communication with the 

 external atmosphere ; the friction, or difference of density of the two atmos- 

 pheres, is indicated by the difference of level of the two columns of water. 

 Advantages claimed are especially the facility of observation and the 

 steadiness of the columns. 



3384. Model of a Ventilator (Ouibal). 



Royal Saxon Mining Academy, Freiberg, 



3385. Mining Barometer. 



3386. Mining Thermometer. 



Elliott Brothers. 

 Elliott Brothers. 



3386a. Davis's Mining and Surveying Aneroid Baro- 

 meter, reading altitudes to 1 foot. John Davis and Son. 



