130 



Some Testimonials as to Experimental Switchboards. 



North eim, IC'ii March 1906. 



I would first like to express my satisfaction with all 

 the fittings supplied by yon for the physics and chemistry 

 class rooms at the new Gymnasium here. The gas engine 

 and dynamo work without a hitch. The nice switchboard 

 has found a suitable place in the physics class room, and 

 I can accordingly charge the accumulators (which will be 

 placed under the lecture table) on the spot, and I am also 

 enabled to employ the current f-om the machine direct to 

 the arc light. 



Prof. Dr. Fest. 



St. P 6 1 1 e n, 29* June 1905. 



The experimental switchboard has arrived, and I feel 

 I must express to you my cordial thanks for the substantial 

 and elegant manner in which it is constructed and for 

 prompt delivery. 



Verwaltung des N.-Oe. Landes-Lehrer-Seminars. 



D o r n b i r n, -2()ii> May 1905. 



As the fittings supplied by you to the Staats-Ober- 

 realschule here have been in use for more than I'/j years, 

 and all are in the same excellent condition in which they 

 were when supplied, I am compelled to express my entire 

 satisfaction. 



The three large glass cupboards supplied for storing 

 physical apparatus are faultless; they shut well and are 

 really dust-proof. The Weinhold lecture table is perfect 

 although composed of so many parts. The darkening 

 arrangement for the 4 windows of the physics class rooms; 

 aspirator and force pump; the blackboard frame and two 

 blackboards, etc. have all proved excellent in spite of the 

 great demands on them. The three-phase-direct current 

 plant together with switchboard satisfies me in every 

 respect: and also the numerous pieces of physical apparatus 

 such as the !arge induction coil with the X-ray outfit, the 

 outfit for the Te?la high-tension experiments, for wireless 

 telegraphy, the Deprez d'Arsonval galvanometer, the 

 quadrant electrometer, the large electro-magnet and the 

 numerous auxiliary apparatus, etc. (all from your works) 

 make the work of teaching both to teachers and students 

 a genuine pleasure. In regard especially to the Roentgen- 

 apparatus, we have been able to carry on difficult radio - 

 scopic and radiographic work. 



Dr. Hans Zuchristian, K. K. Professor. 



Berlin, 16"> May 1905. 



In accordance with my promise, I have to say that 

 the switchboard supplied by you is now working and operates 

 to my satisfaction. From an external point of view also 

 the apparatus creates a good impression. 



Frick, Oberlehrer der II. Realschule. 



St. G alien, 9th May 1905. 



The lecture table is quite up to expectation and is 

 excellently made. The table form experimental switchboard 

 for 30 amps, and 120 volts D. C. with standard instruments 

 is working without a hitch. The other apparatus are also 

 satisfactory, and I must again this time express entire 



satisfaction with all instruments and apparatus supplied. 

 We will not fail to let you know when we are requiring 

 anything further. 



Prof. Dr. H. Renfer, Commercial Academy. 



D ft s s e 1 d o r f, 22 "d May 1904. 



1 am perfectly satisfied with the switchboard de- 

 livered to my instructions. 



Dr. Berghoff, Oberrealschule. 



Berlin C 2, 6'h November 1903. 

 Klosterstrasse 73. 



The switchboard supplied by you is working faultlessly 

 and is to onr entire satisfaction. 



Prof. Dr. Kran>lin. 

 Gymnasium zurn grauen Klostei. 



. Berlin C 2, 5<h November 1903. 

 The switchboard has been erected for some time in 

 the anteroom of our chemistry class and greatly pleases 

 by its nice appearance. 



Oberlehrer Hettwer, 

 Gymnasium zum grauen Kloster. 



Leipzig, 4th November 1903. 



I hereby state that the following fittings have been 

 supplied by Messrs. Max Kohl A. G., Chemnitz, for the new 

 building of the lecture room in the Laboratory of Applied 

 Chemistry, Leipzig University: 



1. A lecture table constructed in modern style with 

 electric switchboard, battery of accumulators, pneu- 

 matic water and mercury troughs, leads for com- 

 pressed air and compressed gases with gas flues working 

 from underneath ; explosion slabs, installation for gas 

 and water, etc. 



2. The back wall of the lecture theatre with stink cup- 

 boards, blackboards and glass slabs ; suspension device 

 for plans, projection table, . reagent stand, and other 

 articles. 



3. Three darkening devices, for the fanlight and the 

 two rows of windows of various sizes on the side 

 walls of the lecture theatre. 



4. An electrically driven air blower. 



All these fittings have been constructed in a neat and 

 substantial manner, special attention being paid to the 

 wishes expressed concerning them. 



Die Direktion des Laboratoriums fur angewandte Chemie 



der Universitat Leipzig. 

 Prof. Dr. Beckmann, Director. 



Stettin, lO'h September 1903. 

 I have much pleasure in stating that the lecture table 

 and experimental switchboard Type B which you supplied 

 last year to the Friedrich-Wilhelm-Realgymnasium present 

 a very neat and substantial appearance externally, and they 

 have worn extremely well. 



Dr. Kohler Oberlehrer, 

 Friedrich - Wilhelm - Realgy mnasium. 



