66 



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



50,357. Lecture Table,, in the Laboratory of Applied Chemistry. Leipzig University (Pro)'. 



Heckmann), Figs. 



L' A, B and C, pp. 8587 



The table is 11.50 in long, 95 cm high and Si) cm \\iclc. being in two parts, and has a l'l;i]> and 

 door in the centre. The top is of 40 mm thick oak in frame and pannellings, is coated thrice with 

 hot linseed oil, and has a water channel miming round the under side. The body is of pitch-pine 

 with oak bottom fillets. It has 12 drawers (some with compartments), 1 large double-door, lock-up 

 cupboard with spring lock, space for installing a batlery of accumulators, and two hiru'e cavities at 

 both ends of the table; the back walls facing the auditorium have fancy glass panels for providing 

 light to the spaces mentioned. 



The following are fitted on the table: Gas lead with 12 gas stopcocks for 1 flame each, 2 stopcocks 

 each for 10 jets, and 1 stopcock for 40 jets, also -2 main stopcocks, the outlets terminating at the 

 front of the table above the top. There is also a water lead with '2 water-tap standards on the narrow 

 side of tl'.e table, each with 3 taps: 1 tall tap standard with rotatory outlet for filling the gasometer. 

 8 water taiis with hose unions: aspirated air lead with .'i conical stopcocks; compressed air lead with 

 2 conical stopcocks; 4 leads for oxygen, hydrogen, nitrogen, carbonic acid gas. etc.. each witli 1 conical 

 stopcoc-k with gauge fitted above; steam lead with steam delivery valve with .lenkins lagging. Wl.ite 

 laboratory basins are placed on the two narrow sides. The table has in addition: 



1 large pneumatic trough (copper) with plate glass sla' 



1 device for raising and lowering mercury troughs; 



1 Mercury Board with sloping bottom; 



2 large Gas Draught Pipes; 

 2 Discharge Sinks: 



2 Explosion Slabs (which are capable of being lowered): 



6 Metal Bushes let into the table top", into which Magnalium Rods may be screwed. These serve as 

 stands. Below these bushes are lead gutters for carrying off es-aping liquids. 



1 Experimental Switchboard for connecting to a 220 volt supply, for taking a current of from 11.04 

 to 20 amperes, with a 48 ohm regulating resistance having .'!<> stages, with large aperiodic precision 

 measuring instruments of 150 mm scale-diameter. These instruments may be rotated so as to lie 

 capable of observation from the auditorium. 



1 Switchboard for charging and discharging accumulators, and for connecting an arc- lam]) up with 

 series resistances. 



Various parts of the table top are laid with white Metilacher tiles and red clay tiles, the latter 

 for standing combustion furnaces upon. On the side facing the auditorium, two drop leaves 1.5o m 

 long and 40 cm wide are arranged under the table to]), upon which preparations, etc. may be placed. 



50,358. Lecture Table, in the Chemical Institute, Breslau (Prof. Ladenburg). Figure . 



The table is 8 in long, 80 cm wide and 90 cm high. The body, of pitch-pine, stained and var- 

 nished, has 4 double-door cupboards with shelves, ami 1(5 drawers. The top is of 40 mm thick oak. 

 laid with white glazed porcelain tiles. The table has gas lead with 12 gas stopcocks with 'nose unions 

 bent upwards, water lead with 6 taps with screwed hose ends; leads for oxygen, aspirated and com- 

 pressed air each with 2 conical stopcocks; also steam lead with steam valve. All leads are laid ready 

 to the floor. The following are built into the table: 2 large draught channels for gases; 4 small water 

 funnels with waste pipes from which to suspend water hoses: 1 large pneumatic trough about TO cm 

 long, with 2 plate glass slabs (the panels of the table being arranged on ihe front and back walls 

 for removing); also 1 device for raising and lowering mercury troughs by means of crank, rack and 

 pinion. 



The covers for the pneumatic trough and of the device for the mercuiy trough are of oak. and 

 can easily be lifted off by handles (detachable). The covers of the cast iron and asphalted draught 

 offtakes are of enamelled iron set in enamelled iron rings. 



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50,359. Lecture Table, in the Chemical Institute of the Technical High School, Dunzis-Lang- r>,-icc , n 



fuhr (Prof. Buff), Figure ' appli 



cation 



The table is 8.20 m long, 95 em high and 80 cm wide. The top is of oak. consisting of frame 

 and pannellings, and is coated thrive with hoi linseed oil. The body is of pitch-pine, the inner side walls 

 and bottoms of red deal, and the beading running round the bottom of oak. The body has 18 drawers. 

 some of them being divided into compartments, and four double-door cupboards with partition. The 

 table is provided with gas. water and steam leads. The gas lead has ?, stopcocks each for 40 jets. 

 2 each for 10 jets, and 12 each for 1 jet. The water lead has 12 water taps with hose unions (4 of 

 these being arranged for connecting up small water jet pumps), with waste pipes underneath. A main 

 tap is fitted for filling the pneumatic trough, this tap terminating in the trough. The steam lead has 

 two outlets. All leads are laid complete to the floor. 



The following arc built into the lecture table: 1 large Pneumatic Trough of stout sheet copper. 

 Fig. A (from the auditorium), F i g. B (as seen by the lecturer). The crystal glass sheet turned 

 towards the auditorium is convex, projects over the front of the table, and, when not in use. is pro- 

 tected by a sliding wall. At the lecturer's side there are in front of the trough 2 electric incandescent 

 lamps for lighting the trough. The trough has direct water delivery, overflow pipe, waste valve, and 

 1 copper bridge for suspending. 



1 Explosion Slab, 90 cm long, 60 cm high, of crystal glass mounted in brass. This slab is sunk into 

 table, balanced by lead weights, and rises automatically on pressing a knob. 



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



