742 SEC. 16. GEOLOGY AND MINING* 



3415. Typical Plans, for showing the works in coal 

 mines; scale, one thousandth (three chromolithographic sheets, 

 0'60 m by 0'80, with a printed note). 



These plans, which are intended as a model for surveyors, may 

 be used for teaching subterranean topography in technical 

 schools. J. van Scherpenzeel Thini, Liege. 



3416* General Vertical Sections, showing the order of the 

 various Seams of Coal in the Yorkshire coal field. 



Walter Rowley, C.E. 



3417. Magazine of Mathematical Instruments. Part IV. 

 upon Mine Theodolites. 



F. W. Breithaupt and Son, Cassel (G. Breithaupt). 



3418. Photograph of a small Box Compass Apparatus. 



F. W. Breithaupt and Son, Cassel (G. Breithaupt). 



3419. Collection of forty-three Thin Sections of Hunga- 

 rian Trachytes from specimens of the Imp. geologische Reich- 

 sanstalt at Vienna. Voigt and Hochgesang, Gottingen. 



3420. Collection of fourteen Thin Sections of Bocks of 

 Monzoni, according to the researches of Professor G. von Rath. 



Voigt and Hochgesang, Gottingen. 



3421. Three Thin Sections of fossil vertebra) of Ichthyo- 

 saurus, Notosaurus. and Squalidarium. 



Voigt and Hochgesang, Gottingen. 



