By a proper grouping of rooms it may be possible for one attendant to temporarily supervise several rooms.

Stack.

An allowance of 10,000 sq. ft. on each floor will provide accommodation for 1,600,000 volumes.

Separate Building or Sub-Basement.

Heating, ventilating and lighting plant.

Basement.
Janitor’s work room300sq. ft.
Engineer’s room (office)300
Engineer’s work room400
Scrub women’s room300
Store room for supplies1,000
Bindery5,000
Printing plant3,000
Auditorium or Exhibition Room4,500
14,800sq. ft.
Ground Floor.
Book Order Dept3,000sq. ft.
Supply Dept2,500
Packing room1,500
Delivery Station room1,000
Repair room1,200
Library for the Blind2,000
Supt. of Building—office500
Coat and parcel room600
Public telephone room} combine {300
Public reception room300
Telephone switch board200
Public toilet rooms700
Private toilet rooms700
Lockers for 200 employees600
Newspaper reading room2,500
17,600sq. ft.
Main or First Floor.
Children’s room5,000sq. ft.
Delivery room (open shelves)3,000
Executive offices4,900
Trustees’ room900sq. ft.
Committee room400
Librarian’s public office400
Librarian’s private office500
Librarian’s Secretary’s office400
Stenographers’ room600
Assistant Librarian’s office400
[400]Supt. of Branches office300
Finance Department1,000
Reading rooms—Periodicals4,000
Reading rooms—Scientific periodicals400
Reading rooms—Store room for unbound back numbers600
17,900sq. ft.
Second Floor.
Reference room10,000sq. ft.
Special reference rooms as follows:—
Statistical Dept.800sq. ft.
Patents room2,500
Map room1,500
Public documents room for readers1,200
Restricted and rare books400
Public catalog1,500
Public writing and copying rooms800
18,700sq. ft.
Third Floor.
Music room1,500sq. ft.
Prints room800
Art book room2,000
Manuscripts800
Photographic room400
Photographic dark room120
Apprentice class room2,500
Staff meeting room1,000
Bell collection1,200
Study and club rooms (3 or 4)1,200
Cataloguing Dept.5,000
Library of Congress Card Catalog room1,000
Traveling Library Dept. and Interchange600
18,120sq. ft.
Mezzanine Floor.
Staff sitting room600sq. ft.
Two lunch rooms:—
One400
One800
Pantry and kitchen
Public restaurant900
2,700sq. ft.
Fourth Story (if any).
Janitor’s living rooms1,500sq. ft.
Totals.

Prof. A. D. F. Hamlin has estimated that the available ground space for the building might vary according to different types of building from 31,250 sq. ft. to 44,600 sq. ft. Our estimate of the space required, including rooms, halls, etc, and stack is about 36,630 sq. ft.

(Above basement):—
Ground floor17,600sq. ft.
Main or first floor17,900
Second floor18,700
Third floor18,120
Mezzanine floor2,700
Fourth floor1,500
76,520sq. ft.
Stack—4 stories of main building40,000
116,520
Add for halls, stairs, walls, vaults, toilet rooms, etc.30,000
146,520sq. ft.
Average per floor (4)36,630

ALPHABETICAL ARRANGEMENT OF ROOMS.

Under each room is given the purpose and best arrangement in relation to other rooms. The list also includes such headings as “Furniture,” “Shelving,” etc.

Accession Department, see Cataloguing Department.

Apprentice Class Room. For students who are taking the training course in the library preparatory to admission to the library service. Accommodations should be provided for one hundred students.

Need not be considered in relation to other rooms, and may be placed on top floor or wherever convenient.

The room might be divided into sections by sliding partitions so that a part or the whole could be used either for class work or for entrance and promotion examinations, and should be planned as a regular school class room containing such necessary appliances as desks, chairs blackboards, etc.

A sufficient number of lockers should be provided in a dressing-room near by.

If the room is not divided as mentioned above, a study room containing a working collection of library literature would make study possible by members of one class while another class is in session.