188 



References at to Projection Lanterns and Skioptica. Testimonials. 



Pforzheim, High School for Girls 



Philadelphia, Arthur II. Thomas Co. 



Plettenberg, Realschule 



Posen , Kgl. Augusta - Victoria - Gym- 

 nasium 



Pribram (Bohemia), Imperial School of 

 Mines 



Quedlinburg, Kgl. Gymnasium 



Radautz (Bukovina), Bildungs-Verein 



Ratibor, Gymnasium 



Recklinghausen, Realschule 



Rheydt, Stadt. Gymnasium 



Ried (Austria), K. k. Staatsgymnasium 



Riesa, Realprogymnasium 



Riga (Russia), Riga School of Com- 

 merce 



Municipal School for Young Ladies 

 Weibl. Lomonosobsker Gymnasium 

 Realschule Friedrich Germann 

 N. N. Mironoff's School of Com- 

 merce 



Hohere Tochterschule Olga von 

 Hasford 



Rio de Janeiro, Escola Politechnia, 

 Laboratorio de Physica 



Rufach (Alsace), Imperial School of 

 Agriculture 



Saarbriicken, Stadtbauamt 



Salamanca (Spain), Adolfo Winzer 



Samara (Russia), Weibl. Privat-Gym- 

 nasium von Frl. Hardin 



Santiago, Mauricio Gleisner & Co. (3) 

 Escuela Normal de Preceptores de 

 Santiago de Chile 



Sarajewo (Bosnia), Obergymnasium 



St. Petersburg, A. D. Min 

 Friedrich Raum (5) 



St. Petersburg, Alexander Hohenstam 



& Co. 



V. 4 th Class Male Municipal School 

 Kaiserl. Medizinische Kriegs- 



akademie 



Institut Kaiser Alexander I. fiir 

 Wegebau-Ingenieure, Electr.-La- 

 boratory 



Viktor Frantzenn 

 Schassburg(Siebenbiirgen), Gymnasium, 



Physics Museum 



Schazk (Gouv. Tambow), Realschule 

 Schleusingen, Kgl. Gymnasium 

 Schopfheim (Baden), Realschule 

 Schwerin a. W., Stadt. Realschule 

 Sereth (Bukovina), K. k. Staats-Gvin 



nasium, Physics Section 

 Sofia (Bulg.), Ministry of Public In- 

 struction 

 Stettin, Friedrich - Wilhelms - Realgym- 



nasium 



Stuttgart, C. & E. Fein 

 Taganrog (Russia), J. Simont, Druggist 

 Tarnow (Galicia), K. k. Oberrealschulo 

 Teplitz, Staats-Elektrotechnikum 

 Tetschen (Bohemia), Kommunal- Real- 

 gymnasium 



Tiflis (Russia), I. Weibl. Gymnasium 

 der Grossfurstin Olga Feo- 

 doroffna 



Tomsk, Technisch-Industrielles Bureau 

 Trieste, Imperial Commercial and Nau- 

 tical Academy, Commercial 

 Section 

 Tsingtau (German China), Kaiserl. 



Gouvernements-Schule 

 Tula (Russia), Miinnliches Gymnasium 



Tver (Russia), Madchengymnasiuin 



Ufa (Russia), Ufimsker II. Weibl. 



Gymnasium 

 Realschule 



Knabengymnasium (Physics Sec- 

 tion) 



Ulm. W. Gottschick 



Uralsk (Russia), Realschule 



Valdivia (Chile), Normalschule 



Valladolid (Spain), Carlos de la Cuesta 



Vienna, Lehmann & Co. 



Allgem. c'istprr. Lehrmittelanstalr 



Vladicowcas (Russia), Wladikaukascr 

 Kadottenkorps 



Votinsky (Russia), Mittlere tecl.n 

 Schule 



Wanne, Realprogymnasium der Amter 

 Wanne und Eickel 



Warsaw, Steinauer & Rejchmann. 



vorm. Jul. Herman & Co. 

 Berent & Plevinski (3) 

 Hohere 7 kl. Kommerzschule 

 A. K. Ubysch 



Weinheim (Baden), Reform-Gym- 

 riasium 



Weiz i. No. b. Graz, Franz Pichler & < '<>. 

 Weiz Electric Works 



Wels (Upper Austria), Stadt. Gym- 

 nasium (Physics Section) 



Wilhelmshaven. Realschule 



Wilmersdorf b. Berlin, Cecilienschulr 



Witebsk (Russia), Weibliches AlexejeU- 

 Gymnasium 



Wjasma (Russia), Gymnasium Kaiser 

 Alexander III. 



Zeitz, Realschule 



Testimonials as to Projection Apparatus. 



The following are a few unsolicited testimonials which have been sent us. 



Glarus (Switzerland), 3]st March 1909. 

 As far as niy observations up to the present go, the 

 apparatus (arc light regulator and transformer) works well. 

 0. Hiestand, Ph. D., Hoh. Staatsschule. 



B i e b r i c h, 16th October 1908. 



I have carried out the fitting and mounting of the 

 Megadiascope myself and tested it at once. It works very 

 well. The images obtained are brilliant and sharp. 



L. Stritter, Director. 

 Realschule mit Reform-Realgymnasium. 



B r e m e r h a v e n, 16th April 1908. 

 As the projection apparatus recently supplied by you 

 has been set up and submitted to repeated tests, I cannot 

 refrain from telling you. that this works in an excellent 

 manner, and it has therefore, like the other apparatus 

 (especially the Weirihold optical bench) met with approval 

 on all sides. The whole consignment arrived here without 

 a fault. 



K. Hansel, Oberlehrer, Gymnasium und Realschule. 



Min den i. W., 3^ December 1907. 

 The projection apparatus supplied by you to us has 

 <iiven entire satisfaction both to my colleagues and myself. 



Prof. Dr. Kohn. 



Konigsberg, Pr.. 13* September 1907. 



I acknowledge with many thanks the receipt of the 

 altered Horizontal Projection Apparatus, and have pleasure 

 in stating that it works excellently and admits of demon- 

 strating many phenomena so plainly and beautifully that 

 I myself am surprised. 



E. Jancke, 

 Oberlehrer a. d. Stridt. Oberrealschule i. K. 



J a s s y, 5h May 1907. 



I take this opportunity of thanking you very much 

 for the quality of the projection apparatus, which works 

 perfectly 



I. Nitrn, Director of the Ecole Normale "V. Lupu". 



D u i s b u r g - M e i d e r i c h, 10 th March 1907. 



(Lower Rhine) 



I am glad to state that the efficiency of the megadia- 

 scope has given us entire satisfaction. It, has yielded very 

 good services in a number of lantern lectures. 



Prof. Hermanni, Realgymiiasium i. E. 



Berlin, 31st August lOOfi. 



The blackboards and the projection screen suit the 

 wall of the lecture room \ery well; the boards act per- 

 iectly. 



Dr. F. F. Martens, Ilandelshochsc.hule. 



B 

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