IV 



Contents. 



Contents. 



Page 



Conditions of Sale II 



Corrigenda II 



Introductory Remarks Ill 



Abbreviations (literature) Ill 



Equipment of Class Rooms 1 



Preface 1 



Hints re equipment of class rooms 2 



Equipment of the Class Room of High Schools and 



Colleges 9 



Lecture tables for physics and chemistry . . 9 

 Accessories for lecture tables: 



Aspirators and Force Pumps 22 



Blackboard Frames 27 



Darkening Devices 29 



Various fittings for class room 33 



Equipment of Preparation Room and Workshop . . 37 



Equipment of Museum 43 



Equipment of Scholars' Laboratory, etc 47 



Equipment of Lecture Rooms and Laboratories of 



well-endowed institutions 57 



Equipment of Dark Room 79 



Equipment of Biology Class Rooms 82 



Wainscottings or Pannellings with blackboard stands, 



for lecture theatres 83 



References to equipments, etc 90 



Testimonials re fittings, etc. supplied 94 



References and testimonials as to Darkening Devices 



with electric motor drive already supplied 98 

 Some Estimates as to Equipments for the Physics and 

 Chemistry Class Rooms, also for the Prepa- 

 ration Room, Museum, and for the Students' 



Laboratory 99 



Experimental Switchboards and Experimental Re- 

 sistances for Institutions and Laboratories 107 



General. 



The selection of the experimental switchboard 

 (type of current, arrangement and construc- 

 tion). The connections 110 



Direct Current Experimental Switchboards with 



one circuit 114 



Direct Current Experimental Switchboards 



with two Circuits 119 



Experimental Switchboards for two kinds of 



current 124 



Current Regulators 125 



Testimonials re Experimental Switchboards .... 129 



Experimental Switchboards supplied up to present 131 



Page 



Gas Generating Plant 133 



Internal Combustion Engines for gas and li quids . 134 



Internal Combustion Engines with Dynamos .... 137 



Electric Transformers 139 



Tri phase-Direct Current Transformers (Motor- 

 Generators) 140 



Alternating - Direct Current Transformers 



(Motor-Generators) 142 



Direct-Direct Current Transformers 144 



Direct - Alternating - Triphase Current Trans- 

 formers 145 



Direct - Alternating - Triphase - Direct Current 



Transformers 146 



Dynamos for Direct Current (Alternating and Triphase 



Current) 147 



Projection Apparatus and Accessories 149 



General Remarks. Mode of illumination . . 149 



Prices of Projection Apparatus 160 



Accessories for Projection Apparatus 168 



Projection Screens 179 



Auxiliary Apparatus for Projection Purposes. . . . 181 



Projection of objects lying in a horizontal plane 181 



Reflecting Prisms for erecting the images . . 182 



Megascopes for projecting opaque objects . . 182 



Projection of Microscopical Preparations . . 183 



Chromoscopes 185 



Cinematographs 185 



Enlarging Apparatus 186 



References re Projection Lanterns and Skioptica . 187 



Some Testimonials re Projection Apparatus .... 188 



Estimates re Projection Equipments 189 



Physical Apparatus for projection 190 



Kohl's Megadiascope 1201 



General. Description. Experiments with 

 transmitted light. - Experiments with 



reflected light 1203 



Instructions for using Kohl's Megadiascope . . . 1217 



Price List of Megadiascopes 1218 



Accessories 1221 



Special Outfits 1222 



Switchboards and Resistances 1226 



Projection Screens 1228 



Estimates . 1230 



Testimonials 1231 



References as to Megadiascopes 1232 



Index . 1233 



Printed by Hugo \Yilisrh. Chemnitz. 



