58 



Equipment of Lecture Rooms and Laboratories of Institution? whose Funds are not restricted. 



50 347 A. 1 : 20. 



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50 348 A. I : 20. 



cover, and with terminals for cable sockets, and distributed over the table are 2 plug boxes for 30 amps. 

 The power supply current lead has 1 double-pole instantaneous switch for 100 amps, silver fuse-strips, 

 protecting cover, and with terminals for cable sockets, and on various parts of the table 3 plug boxes 

 to 30 amps, and 2 plugs each with 3 m double lead; 2 pieces, 1.5 m long, flexible cable lead for 

 100 amps., with pole shoes, are given in. Two terminals connected with the water lead serve to 

 make a good earth. On the left-hand narrow end a projection table is fastened to the lecture bench 

 (F i g. A). This table is of oak and can be adjusted in an up and down direction by a rack and pinion. 

 The upper table top can be inclined, thus allowing the lantern to be tilted, in order that the image 

 may be projected as high as possible on the screen. The acoustical bellows can be also arranged for 

 electric motor drive. 



50.347. Lecture Table, in the Physics Department of the Charlottenburg Technical High pr - co o 

 School, Figure apr li. 



The table is in 2 portions, having a passage in the centre, with draw flap, and with a leaf 

 75 cm long at each end supported by folding struts. The table top and leaves are 1 m wide, and 

 consist of 40 mm thick oak, being composed of frame and pannellings. The body is of pitch-pine 

 and has 12 doors and 2 double-door cupboards. A heating device is fixed in each cupboard. These 

 ovens, constructed of fire bricks in an iron housing (F i g. A) are heated with gas and have copper 

 cover plates protected from the direct action of the heat by a stratum of air and by an iron plate. 

 This device keeps electrical apparatus quite dry without their becoming damaged by too great a heat. 

 The heating devices when not in use are covered by slate slabs, which can be drawn out by handles 

 fixed in them. The table has, in addition, a deep pneumatic trough with water tap outside and an 

 arrangement for screwing apparatus on the bottom of the trough. The trough has an overflow, also 

 waste valve. Gas lead with 8 stop-cocks, water lead with 2 taps, and leads for aspirated and com- 

 pressed air each with 1 stop-cock are laid on down to the floor. 



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50,348. Lecture Table for Physics (F i g u r e), as supplied to the High School of Commerce, p,.;,.,. (M1 



Berlin, together with Travelling Table No. 50,349 



This lecture table is 3.60 m long, 80 cm wide and 90 cm high. The top is of oak, is com- 

 posed of frame and pannellings, and is acid-proof painted. The body is of pitch-pine, it contains 

 12 drawers and has two large hollow spaces, one being shut off at the students' side by ornamental 

 glass. The base fillets are rounded off at the edges, in order that they may not be disfigured when 



api li- 

 oation 



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



Cl. 4(147, 111 Hi. 



