No. :.0349. 



Lecture Tables. 



59 



50 347. 1 : 40. 



50 348, 50 349. 1 : 30. 



knocked and may be exposed to the minimum of wear. The table has a gas lead with two stop- s. d. 



cocks and hose unions turned upwards, on the students' and the lecturer's side. It is possible by using 



these unions to connect burners and apparatus on the lecture table to the gas lead by hoses without 



kinking occurring. A hose stopcock is fitted on the left-hand end of the table in order to supply with 



gas the travelling table (see illustration), which serves to lengthen the lecture table. In addition the 



table has one lead each for aspirated and compressed air and for water. The water lead serves as 



inlet to the pneumatic trough and a water waste is also fitted. The pneumatic trough usually has 



its place inside the table and is then covered over by a slate slab in such wise that the table top is 



quite plane. After removing the cover plate it can be raised for use by an elevating device until 



it rests completely above the table. The 4 side walls of the trough are glazed; the side turned towards 



the audience is arched so that the students sitting sideways may not be deceived as to the position of 



objects in the trough. The trough is connected direct to the water lead and has an overflow and a 



waste valve, also a removable bridge. The electric lead of the lecture table terminates at the 4 corners 



of same in a small marble slab : each slab has a plug box with plug for 30 amps, direct current and 



alternating current. 2 terminal boxes for accumulator current of 36 amps, and a plug box and plug 



together with switch for connecting up a table lamp. 



50,349. Travelling Auxiliary Lecture Table (see F i g u r e), also serving as Preparation Table 



for containing pieces of apparatus in the preparation room" and to lengthen the lectiire p r j Cl1 on 

 table . 



The table, resting on rubber rollers and movable in either direction, is of the same height and 

 width as the preceding lecture table. It is 1.20 m long, 80 cm wide and 90 cm high. In the pre- 

 paration room are set on the table the apparatus which require a long time to set up or those appa- 

 ratus which are not used at the commencement of the lecture and which should not attract attention 

 during the lecture. The table is then brought into the lecture room. The construction of the tra- 

 velling table corresponds to that of the lecture table. It has on each of the narrow sides a lengthening 

 leaf of 50 cm. The table top has a removable portion; this can be substituted by a perforated metal 

 sheet, which covers a glow lamp heating device. The heater serves to heat electrical apparatus. The 

 table has a glas lead with 2 stopcocks and a plug box for connecting the electric heater with the 

 lecture table or with corresponding leads in the preparation room. 



appli- 

 cation 



See also the Lecture Tables at the commencement of this List. 



Cl. 40.-*. 4903. 



