98 



References as to Darkening Devices with Electric Motor Drive. 



St. Gall en, 9''" May inor>. 



The lecture table is exactly in conformity with my 

 wishes and is well constructed. The table form experimental 

 switchboard for 30 amps, and 120 volts D. C., with pre- 

 cision instruments, works faultlessly. The other ap|>;ir:itus 



are also satisfactory, and I can thus express to you our 

 fullest satisfaction again this time for the instruments and 

 fittings supplied. We shall not fail to bear you in mind 

 in our future requirements. 



Prof. Dr. H. Renfer, Commercial Academy. 



References as to Darkening Devices with Electric Motor Drive. 



Aix-la-Chapelle, Reiff -Museum 



Berlin, I st Chemical Institute of the 



University 



Physical Institute of the University 

 Anatomical Institute of the Veteri- 

 nary High School 

 Preuss. Kultusministerium fur den 

 Horsaal der Deutsch. Unterr.- 

 Ausstellung, St. Louis, 1904 

 Kaiserin - Friedrich - H aus 

 Commercial High School 



Briinn (Moravia), Physical Inst. of the 

 Royal Imperial German Tech- 

 nical High School 

 Electrotechnical Institute 



Charlottenburg, Institute for Chemical 

 Technology of the Royal Tech- 

 nical High School 

 Chemical Institute of the Royal 

 Technical High School 



Chemnitz, Pathological Hygienic Insti- 

 tute of the Municipal Infirmary 

 (also fanlight) 



Konig - Albert - Museum ( also fan - 

 light) 



Kgl. Techn. Staats-Lehranstalten 



Darmstadt, Technical High School (also 



fanlight) 



Technical High School extensions 

 (3 fanlights) 



Dresden, Kgl. Frauenklinik (also fan- 

 light) 

 Royal Technical High School 



Frankfort-on-the-Main, Akademie fur 

 Sozial- und Handelswissen- 

 schaften 

 Physical Institute (also fanlight) 



Geneva, Bacteriological Inst. of the 

 University 



Gottingen, Institute for Applied Elec- 

 tricity (also fanlight) 



Innsbruck, Commercial Academy 



Jena, Mineralogical Inst. of the Uni- 

 versity , 



Kiel, Chemical Institute of the Uni- 

 versity (large lecture hall) 



La Plata (Argentine), Physical Institute 

 of -the University 



Leipzig, Lab. for Applied Chemistry, 

 University (also fanlight) 



Physical Inst. of the Univei--.it v 

 (also fanlight) 



Pathological Inst. of the Univer- 

 sity (also fanlight) 



Hygienic Inst. of the University 

 (also fanlight) 



Universitats-Frauenklinik (also fan- 

 light) 



Chemical Laboratory, Liebigatrasse 

 (also fanlight) 



Magdeburg, Kgl. Maaohinenbauacirale 



Mons (Belgium), Kcole des mines du 

 Ilainaut 



Prague, Physiological Inst. of the Royal 

 Imperial Bohemian University 



Tomsk, Physics Lab. of tin- Techno- 

 logical Institute 



Tubingen, Chemical Institute of the 

 University 



Wilmersdorf (Berlin), Goethesi-hule 



Wiirzburg, Pathological Inst. of tin- 

 University 



Gottingen, 26 th November 1907. 



The fanlight darkening arrangement for our lecture 

 room, fitted by you, works to our entire satisfaction after 

 we have made a few slight alterations. The blind works 

 wit'i very little noise and sufficiently rapidly, and com- 



pletely excludes light. Up to the present no hitch in the 

 working has been observed. 



Prof. Dr. Herm. Th. Simon, 



Institute for Applied Electricity. 



