Franz Schmidt & Haenscli, Berlin S. 67 



No. 2784. 



Pranz Schmidt & Haensch in Berlin S. 



4 Stallschreiberstrasse. 

 Mechanical and Optical Works. 



All the instruments produced by this firm are made under personal 

 supervision by thoroughly trained and skilled workmen. The firm is thus 

 prepared to supply the best and to realize the highest requirements. Be- 

 side the current manufacture of microscopical, polarizing", spectroscopic, 

 photometric and photo-spectroscopic apparatus the firm is engaged in 

 the production of the finest instruments for scientific investigation. 

 Many of the latter have been made for inland and foreign institutes. 

 Among the scientists to whom instruments of this class have been 

 supplied may be named: 



Prof. Cox of Montreal, Prof. Dobrowolski of St. Petersburgh, 

 His Excellency, Prof. v. Helmholtz of Berlin, President of the Impe- 

 rial Physical and Technical Institute, Prof. Hering of Prague, Prof. 

 Holmgren of Upsala, Prof. Arthur Koenig of Berlin, Prof. Kundt of 

 Berlin, Prof. Landolt of Berlin, Prof. V. von Lang of Vienna, Prof. 

 Lippich of Prague, Prof. J. H. Long of Chicago, Prof. Nasini of 

 Padua, Prof. Soret of Geneva, Prof. H. C. Vogel of Potsdam, Prof. 

 H. W. Vogel of Charlottenburg, Prof. Leonhard Weber of Kiel, 

 Prof. Wiley of Washington, Mr. Lewis Wright of London. 



In the following paragraphs a short description will be given of 

 the current apparatus made in this establishment. The greater part of 

 these instruments will be found represented by the exhibits forming part 

 of Group 21 of the Collective Exhibition of the ^Deutsche Gesellschaft 

 fur Mechanik und Optik". Other instruments made by the same firm 

 are shown among the German Educational Exhibits of the Prussian 

 Ministry of Public Instruction. 



A. Spectroscopic Appliances. 



/. Spectrum apparatus with deflected path of rays-, 

 II. Spectrum apparatus with rectilinear path of rays; 

 III. Spectrum apparatus for astronomical purposes; 

 IV. Spectrometers of various types; 



V. Spectrum apparatus for special scientific and technical purposes; 

 VI. Apparatus for demonstrating spectrum phenomena; 

 VII. Auxiliary appliances. 



I. Spectrum Apparatus with deflected path of rays. 



a. Small Spectrum Apparatus. 



Mounted upon a cast iron tripod stand, with column and dish-shaped 

 stage plate fitted with 3 telescopes (viz. observing, slit and scale te- 



