Equipment of the Class Rooms. 



The space and the objects to be installed are so arranged that they can be used for physics, 

 or in case of need, for chemistry. In passing on to the discussion of the individual rooms, the most 

 important articles necessary are enumerated. With due regard to the varying local conditions and the 

 difference in the amount of funds available for equipment, we have drawn up an estimate at the 

 end of the list; if desired, we will be happy to prepare such to suit individual cases. 



In the Physics Class Room the windows are arranged, having regard to the erection of an ex- 

 perimental table, in such wise that the longitudinal axis of the lecture table runs on the centre 

 of a mullion to allow of a wall heliostat being used. The distance of the experimental 

 bench from the wall receiving the blackboard is from 1,50 to 2 m. The windows can be easily 

 arranged from these data. If in the case of completed buildings the windows have been constructed 

 differently from the manner just mentioned, i. e., in such wise that the longitudinal axis of the bench 

 is towards a w i n d o w, the heliostat can be inserted in the darkening arrangement of the window 

 in question, being maintained by a holder screwed into the window board. There should be a free 

 space of at least 60 cm between the experiment table and the first 

 row of benches. For a Physics and Chemistry class room (see Tables I and II) a lecture bench 

 of at least 4 m long is essential. This bench should if at all possible be connected up to the gas, 

 water and electricity supplies themselves so that no piping or leads of any kind for the use 

 of gas, water or electricity need be laid between the blackboard and 

 the bench. Besides the supply pipes, etc., just mentioned, it is desirable to have at the same 

 time piping laid for the purpose of producing a vacuum and air pressure 

 obtained by means of water air-pump and a water jet blower respec- ^ 

 t i v e 1 y. Further, a gas waste pipe, low-pressure water system, piping 

 for steam, oxygen, carbonic acid gas, etc. can be fitted according to ? 

 therequi-rementsofeachindividualcase. - 



For taking off the gases at the lecture table, it is important that a gas > 

 exhaust should be arranged in one of the neighbouring walls in such manner that the piping leading p 

 to this flue may be laid under the floor or underneath a platform. This flue can also be utilised in con- 

 nection with the draught cupboard and the stink cupboard in the wall. This flue or channel must ^ 

 have two connections with the draught cupboard, one underneath, over the slate slab, for ^ 

 heavy gases; the other above for light gases. The channel can best be formed of inter- 

 nally glazed acid-resisting stoneware pipes of square section. If 

 desired, we shall be glad to supply these pipes and also the unions and the acid-resisting ; : 

 cement; and we would respectfully ask that building authorities and teachers should communicate 

 with us in connection with this question before the completion of the masonry. All conduits should a 

 be laid in the floor up to the lecture table, and the electric leads, piping, etc. of the bench, as 

 constructed by us, all commence at the floor. We would mention the following special fittings 

 for the lecture bench: expanding leaves, the pneumatic trough, built into the table (possibly fitted 

 with lowering device), the explosive slab (capable of being lowered), wind-chest, etc. Finally, we wou'd 

 refer to the complete descriptions of the various experiment tables. 



As auxiliaries to the table the following objects may be mentioned: a travelling 

 table which can conveniently pass through the doors leading from the preparation room and the 

 museum; a draught box for placing over the gas exhaust on the experiment table; a draught pipe, 

 which is better for many experiments; a support or a stand for pendulums etc.; a sliding slab for pro- 

 tecting the top of the bench and for setting to one side apparatus that have been used; a switchboard. 



For purposes of illumination, in the case of darkened rooms, on dull days and 

 in the evening, a number of lighting units will be necessary for providing light for the lecture table 

 and the blackboard in addition to the gas distributing pipes, when gas is used for the purpose. Electric 

 light should naturally be given the preference from a hygienic standpoint, and the switching on of 

 the various lamps can be conveniently arranged. A good table lamp should be provided so that each 

 individual apparatus or parts of an apparatus may be well illuminated. For the transport of heavy 

 objects, electromagnets, electric motors, etc. over the lecture bench, an I-beam should be arranged 

 on the ceiling to take a traveller, pulley blocks being suspended from the latter. Lighter pieces of 

 apparatus can be set up on a board suspended from the I-beam. For the reflecting galvano- 

 rn e t e r, a wall bracket can be fixed to the black board wall, a transparent scale being arranged over the 

 lecture bench; or a suspended board or other roof suspension can be provided over the bench, and an 



