Laboratories, their planning and fittings . he back of the seat below) should be 29 ins. to 30 ins. The pointof intersection of the line to the table clearing the lowest students head withthe vertical through the second seat, gives the eye of the second tier student,and 6 ins. above this, as before, a line from the lecture table continued back,will, on the next vertical, give the position of the third tier students eye, andso on. A slight tilt on the seats will much add to comfort by bringingpart of the weight of the body on to the thighs, and thus decreasing theweight per unit area ; the back
Laboratories, their planning and fittings . he back of the seat below) should be 29 ins. to 30 ins. The pointof intersection of the line to the table clearing the lowest students head withthe vertical through the second seat, gives the eye of the second tier student,and 6 ins. above this, as before, a line from the lecture table continued back,will, on the next vertical, give the position of the third tier students eye, andso on. A slight tilt on the seats will much add to comfort by bringingpart of the weight of the body on to the thighs, and thus decreasing theweight per unit area ; the backs and desks should also slope slightly, theaccepted angle for the latter being about 15 degrees. Fig. 30 shows a 1 Scott Russell, Edinburgh, Phil. Jour., 1839 : The line touching the edges of seatsin section is called an * isacoustic curve. Acoustics in Relation to Architecture and Build-ing, Roger Smith, about 1870. Design and Equipment of Chemical and Physical Labora-tories, T. H. Russell, 1903. THI<: KI<:OUIRKMKNTS OF CUKMISTRY ^i. 3 o O 52 LABORATORIES section through such seating and the constructional lines necessary for its,determination. Preparation Room.—No rules can be laid down for the size of room. It should be remembered, however, that for advancedwork much setting up of delicate apparatus may be done here, hence thearea must not be too limited. In a school, space for ample shelving and a,good wall bench will usually be sufficient, but for advanced work a largecentral bench has often to be accommodated in addition. Two doors areusually necessary, one to the lecture theatre and the other to the corridor orpossibly laboratory. These should be near one another if possible so thatthe room does not become a passage. The floor is preferably wood, and somuch of the walls are covered by cupboards that if tiles or glazed bricks areused on the walls they are only necessary to a very limited extent. Some-times this room is used for making up solutions of
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