No. ! 



Accessories for the Lecture Tables. 



19 



50 105. 



50 107. 1 



50.098. Iron Pendulum Stand, for the Lecture Tabl'> for suspending pendulums, pulley blocks, 

 electromagnets, etc 0. 16. 6 



For this purpose the lecture table must be provided with two bushes into which two columns can 

 ? be screwed: the latter each has a clamp with hook upon which a cross bar may be placed. 



a 



50.099. Sliding Slab, foi placing on the Lecture Table; 1.2 m long, of same width as the table, 



g 20 mm thick (M. T.. p/4) 2. 0. 



The slab is made of oak, being composed of frame and pannellings; it is furnished with fillets at 

 ,3 the side which pass along the edge of the table. The slab runs on low rollers and acts as a pro- 



tection to the table top." Apparatus set up on the slab can thus be easily moved to one side. 



z 



50.100. Switchboard, for letting into the lecture table or travelling table, for 2 circuits, with 



slate cover and plug handle for raising the latter (see Figure) 5. 0. 



,J The switchboard is designed for connecting up to -2 circuits (alternating --or 3-phase -- and 



direct current) and contains 5 single-pole fuses. 1 double-pole switch. 1 plug box with flexible for 



< 2 leads, 1 3-pole switcli and 1 plug box with flexible for 3 leads: all apparatus being mounted on marble 



slab. The leads necessary on the table are included in the price. 



3 



f>n. 101. Cistern for low-pressure water service (Figure), with float and automatically 



x closing valve (W. D., p. 16), without piping 1. 8. 



< The pipe carried to the right of the cistern serves as inlet, and the one connected underneath 



^ as waste, while the one connected above on the left serve* as overflow in case the floating valve fails 



to act. The low pressure system can be connected with a special pipe line of the lecture table or that 



of an experimental bench. The cistern is fixed in the preparation room. 



f>o.l02. Overflow Pipe, with waste pipe (W. D., Fig. 8), for taking off water at high or low 



pressure at will at the lecture table 1. 5. o 



50.103. Light Burner with large Shade, for lecture table and blackboard, as suggested by 

 W e i n h o 1 d (W. D., Fig. 6), designed for incandescent light, Figure, with mantle 



and chimney 0.11. 



One lamp should be provided for every metre of table length. 



50.104. Gas Distributing Device, ready screwed together (Figure), with 5 taps .... 1.10.0 



The centre pipe is the main pipe with the main cock: the pipe to the left the lead to the lamps 

 for the table; the pipe to the right the lead to the lamps for the auditorium. The object of the device 

 is that the gas to the table and the lecture room or to each may be turned as low as possible without 

 the lamps being extinguished altogether. 



50.105. Shade for electric glow lamps, for shading the light on the side of the students, Figure 



with mount, nipple and holder; without glow lamp 0. 3. 6 



50.106. Dimming Switch, for slowly darkening the glow lamps over the lecture table, for 



4 25-candle lamps or 6 16-candle lamps 1. 0. 



50.107. Nernst Lamp with large shade (Figure), for lighting the lecture table and blackboard 1. 0.0 



The lamp is shielded from the lecture room. In ordering, please state pressure of circuit on 

 which it is to be used. If this is not given, a 110 volt lamp will be supplied 1. o. o 



Experimental Switchboards (see special section). 



Cl. IS, 3179. 



2* 



