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PRINCETON PSYCHOLOGICAL LABORATORY

BY H. S. LANGFELD

Princeton University

Until last year research in psychology at Princeton was conducted in a few rooms on the top floor of Nassau Hall, but these quarters were very inadequate both as to space and general arrangement. Through the efforts of Professor Howard C. Warren a fund was obtained for the erection of a new building to be called Eno Hall after Mr. Henry Lane Eno, who contributed the larger part of the money. Professor Warren spent several years in visiting laboratories throughout the country and in ascertaining the needs of modern psychological research, and on the basis of this study, and with the coöperation of Professors Brigham, Dunlap, McComas and Zigler, he devised the plans of the building. The cornerstone was laid in January 1924 and the Department moved into the laboratory the following December. In April 1925, at the time of the meeting of the Experimentalists, Professor E. B. Titchener gave an address entitled 'Experimental Psychology: A Retrospect' in honor of the formal dedication of the building.

Eno Hall is 25 ft x 128 ft and consists of two floors and a basement. It is of fireproof construction throughout, the floors and stairs being of reinforced concrete, the walls of hollow tile and concrete with an outside finish of brick and white sandstone trimmings. The roof is flat with a solid balustrade running completely around it. The building faces north and south. There are two entrances in Collegiate Gothic style, one in the middle of the north side and the other in the middle of the south side of the building. Over the north door is inscribed 'Psychology' in old English letters and over the south door the motto from the Delphic Temple, 'Tvili Zavτóv.' Each entrance has a small vestibule with inside and outside doors.

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Research Rooms. The principle followed in the arrangement of the research rooms was to have a large number of small rooms which could be used either for individual research, for undergraduate training courses, or for offices. These rooms are therefore all approximately of the same size and have the same arrangement for electric current, gas, etc. They are on the first and second floors and on both sides of the corridors, which run almost the length of the building and are slightly off center in order to allow for larger rooms on the south side. There are twenty of these rooms, the ones on the south side being 9 ft x 14 ft. Six of the rooms have bay windows which give them several additional feet. All of the rooms have doors with ground-glass panels leading into the corridors and four of the rooms have a second solid door to keep out light and sound. There is also a door between adjacent rooms, so that they can be arranged in suites if desired. The longest row of communicating rooms is on the south side of the second floor and consists of six rooms. On the first floor four rooms can be thrown together and these rooms are generally used for undergraduate instruction and research. There are also suites of three rooms. In each room there are three outlets for direct current on each side wall, and one outlet for alternating current, and also three 'dead' sockets on each side wall for communication between rooms. In addition there are in each room outlets for gas and compressed air, and two wooden instrument rails around three sides of the room to which apparatus can be attached. The rails are either bolted to a similar rail on the opposite side of the wall or screwed into expansion plugs. The lower rail is 3 in wide and 40 in from the floor. The upper rail is 4 in wide and 3 in below the ceiling. The latter rail can also be used as a picture molding. Ten of the rooms are provided with a work bench, which is built over the radiator beneath the windows and extends the width of the room.

Dark Room. There is a dark room on each floor. All are provided with outlets for electricity, gas and air, and instrument rails, as the other research rooms are. They have also a soapstone (Alberene) sink and hot and cold water.

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The dark room which is in the basement is 9 ft x 14 ft. It has no windows. Ventilation in this room is provided by a light-proof ventilator from the next room. The entrance is made light-proof by means of two doors which can be fastened together by a brass bar to form a sector of 45°, and which swing like revolving doors except that they only revolve through a semicircle and then swing back, instead of making a complete revolution. Rubber strips are attached to the edge of the doors to cover the cracks. When the doors are fastened together by the bar, one of them is always in contact with the curved wall of the vestibule, so that light can not enter at any point in the swing. The walls, ceiling, and floor of this room are painted black. The dark room on the second floor is 12 ft square. It also is painted black and has a similar arrangement of doors. It has two windows provided with light-proof shutters. The dark room on the first floor is also 12 ft square and its walls and ceiling are painted white. It likewise has two windows provided with light-proof shutters. The entrance has double doors one behind the other. This room is intended primarily for undergraduate work.

Sound-proof Room.-This room is in the basement and access to it is through a smaller anteroom 7 ft 8 in x 4 ft 41⁄2 in. This latter room has two doors of 2 in thickness at the entrance with a passage I ft deep between them. The inner door is heavily padded round the edges. The walls of this room consist of 1-in Celotex and plaster, 81⁄2 inches of hollow tile, and 131⁄2 inches of concrete. The floor, which is covered with 4-in cork, consists of 1-in cement finished on 3-in concrete slab, and beneath this slab is a bed of cinders. The walls and ceiling are painted black. The entrance to the S. P. room proper is through a vestibule 21⁄2 ft in depth. There is a 2-in thick wooden door padded round the edges at each end of the vestibule. The S. P. room is 15 ft 4 in x 9 ft 7 in and is 8 ft 5 in high. It is virtually a building within a building. The walls consist of I inch of Celotex and plaster, 4 inches of hollow tile, and 4 inches of air space which separates the room from the concrete and hollow tile construction of the

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