Advice as to the Arrangement. 



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ordinary linen scale on tin- 

 black board or on one of 

 the side v. alls. The water 

 air pump with the water 

 jet blower are arranged 

 on a common board placed 

 on the blackboard wall 

 (see Plate II). The ex- 

 perimental switchboard 

 (our complete price list of 

 these may possibly help 

 in its selection) is likewise 

 fitted to this wall, in order 

 that the deflections of the 

 measuring instruments 

 may be observed by the 

 students. By means of 

 a flexible lead with 2 

 plugs and one plug box 

 each on the wall and on 

 the switchboard, the 

 switchboard can be com- 

 pletely separated from 

 the lecture table. The 

 blackboard stand occupies 

 the centre of the board 

 wall. The draught cup- 

 board does not require a 

 special room when it is 

 aranged in a wall niche 

 a ccording to Pla tel and II. 

 It is in this case also acces- 

 sible from the preparation 

 room. As to the draught 

 conduit, mention has al- 

 ready been made of this. 

 The darkening arrange- 

 ment (see Plate III) is 

 fitted both in the c 1 a - - 

 room and the prepara- 

 tory room. All the 

 windows of a room are 

 darkened s i m u 1 t a- 

 n e o u s 1 y by pressing a 

 hand lever, or by electric 

 motor. The projection 

 screen is fitted in front 

 of the blackboard frame. 

 The screen, rolled up, 

 rests underneath a curtain 

 protecting it from dust, 

 being let down by means 

 of a cord arrangement. 

 On one of the walls a 

 laboratory basin with 



Cl. 530". 



