CHEMICAL LABORATORY AT THE UNIVERSITY OF SYDNEY. 173 



The special re-agent shelves, etc., aie placed between the 

 drauglit cup-boards, so as to be readily accessible to all. 



LECTURE ROOM. 



The principal lecture-room is thirty-four l)y forty-seven feet, 

 and has a height of twenty-two feet in the centi-al part, the wall 

 being sixteen feet high. The seats are arranged for one hundred 

 and eighty students, but, if necessary, nearly two hundred can be 

 accommodated. It is partly lighted by three windows at the 

 side, and by a skylight facing south in the roof over the lecture 

 table. The principal entrance is from the corridor, but in case it 

 should be necessary to empty the room quickly, there is a second 

 door on the opposite side. The two doors at the other end are to 

 give access to the space under the gallery, which will be used as 

 a preparation room or store for lecture aj^paratus. A direct 

 entrance into this space is by a trap door and flight of steps from 

 one of the middle tiers of steps. The upper, portions of the 

 windows open on hinges, so that ample ventilation should be 

 obtained, and no other artificial ventilation will probably be 

 necessary, beyond gas jets in the side Hues. If the funds 

 permit, it is intended to light this room by incandescent electric 

 lamps, or by the Clammond or other incandescent gas burner. 

 The Bower ventilating light is being much used in English 

 laboratories, and may be substituted for one of the others. 



The diagram screens of red baize are large and can be readily 

 lowered. Other diagram frames, in the form of light iron gallows 

 (Plate VII.), are provided for extra diagrams which do not 

 require to be exposed during the whole of the lecture, as well as 

 an easel stand, for heavy diagrams or pictures that cannot be 

 hung. 



The lecture table (Plate VIII.), of polished pine with teak top, 

 is twenty-seven feet long and three broad, and is provided with 

 an ample supply of gas and water, with leads for the electric light, 

 also aspirators, air blasts, together wiih oxygen, hydrogen, and coal 

 gas under water pressure from the cistern in the roof, thus doing 

 away with the need for gas bags, and their inconvenient pressure 

 boards. There are also six-inch down di'aught flues, provided 

 with moveable trumpet-shaped cowls, so ari'anged that an 

 experiment can be performed either in front of the hoods 

 or under a glass hood, over the flues themselves. In the 

 table there is also a glass pneumatic trough, which can be lighted 

 at the back with gas at night, so that the students can see all the 

 details of the experiment as readily as in the day time. On tjie 

 opposite side of the centre of the table, and con-esponding in 

 position, is a mercury trough and tray. 



Instead of using cane chairs, as at present, it is proposed to 

 have the seats in the lecture rooms made of stout wire gauze, 

 covered with Brussels carpet (Plate XIII.) as it is thought this will 



