12 



Equipment of the Class Rooms. 



n. :> 0,020 



50 003, 50 Oil, 50 012, 50 019, 50 022. 1 : 23. 



50.020. Glass Pneumatic Trough, can be lowered, as No. 50,019, with polished rim, Length, 40 cm, width 25 cm, . s. d. 

 height 18 cm, with zinc bridge Extra price as against zinc trough < 4. 0. 



The trough is filled and emptied by a water hose. 



50.021. Explosion Slab, can be lowered. Constructed of stout crystal glass, mounted in a brass frame (Figure). 

 It is placed at the front of the table and the students are protected in the case of experiments in which 

 explosions and spurting might take place Extra price 6. 1.0 



This explosion slab is 90 cm. in length, 60 cm. in height, and 6 -8 mm. in thickness. By pressing 

 a knob the slab is raised out of the table and remains in its highest position. 



50.022. Wind Chest for blowing pipes, sirens, etc. in conjunction with the compressed air main (see Figure), 



with 8 valves; without pipes Extra price 2. 4. 



The wind chest does not correspond with the figure, being built into the table 

 top, and not built on top thereof. When not in use it is covered over with a sliding slab. 

 50,022 a. The preceding, with 4 valves Extra price I 1. 7. 



50.023. Passage in the centre of the table Extra 1. 13. 



This arrangement is only of value in the case of tables over 4 m in length and necessitates the 

 laying of double lines of piping if taps are desired on both halves of the table. 



50.024. Installing a third conductor rail in the table top in connection with 3-phase networks. . . . Extra 0. 1 4. 



50.025. Installing a third and fourth conductor rail in the table top in conjunction with the use of switchboard 



with 2 separate circuits Extra 1. 7. 



50.026. Connection Lead, for connecting the table up with the experimental switchboard, from the metal rails 

 in the lecture table to the floor, laid in conduit with brass covering. For connecting to 2 rails 



Extra cost 0. 11. 



50.027. do., for connecting to 3 r a i 1 s Extra cost 0. 17. 



50.028. do., for connecting to 4 r a i 1 s Extra cost 1. 2. 



50.029. Heavy Current Lead for 30 amperes direct current or monophase alternating current, laid separate from 



the rails let into the table. With double pole plug box Extra cost 0. 17.0 



The plug box is connected up with stout copper wires, which are laid in brass covered insulating 

 conduit as far as the floor. These wires must then he carried from the floor to the wall, where they are 

 connected below the switchboard to another plug box. 



50.030. The preceding, with 3-pole plug box Extra ; 1. 0. 



Lecture Table, completely free from iron, otherwise as previous model, with locks, keys, ; 

 screws leads, etc. of brass instead of iron. 



With oak top ] Length of Table 

 ( Price 



List ]STo. 50,031 

 m. 3 



25.12.0 



List No. 50,036 

 With teak top \ Length of Table m. 3 



I Price 28. 1. 



50,032 



3.5 

 28. 18. 



50,037 



3.5 



50,033 



4 



31. 7. 

 50,038 



4 



31 .13. 34. 13. 



50,034 



4.5 

 33. 11. 



50,039 



4.5 

 37. 3. 



50,035 



5 

 36. 6. 



50,040 



5 

 40. 9. 



The gross weights are given only approximately and hold for batten packing: about 330kg 

 for a length of 3 m, 390 kg for 3,5 m, 435 kg for 4 m, 480 kg for 4,5 m, 550 kg for 5 m. 



Special Fittings (see Nos. 50,01150,030). 



50,041. Physics Lecture Table (as suggested by Grimsehl, see Figure), 4 m. in 

 length 



This table is 4 m. in length, 90 cm. in height, and 80 cm. in width. The table top, which is 

 quite smooth and not inlaid, is composed of 4 cm. thick oak frame and panneUings. It 

 has an extension of 50 cm. at the left side which can be let down as desired. The top is impregnated 



29. 3. 



Cl. 4831. 



