Design of the Illumination of the New York City Carnegie Libraries

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Page 539 - Sufficient illumination for the library staff to oversee the entire floor. (4) Sufficient illumination to provide a moderate reading light in all parts of the room, to admit of the relocation or Fig. 2.— Second Floor, Carnegie Library. addition of furniture, such as portable magazine filing racks, etc. (5) Moderate cost of installation. (6) Economy of operation. This must take into account not only the system of illumination and type of lamps used but also the switching arrangements. (7) Simplicity...
Page 556 - Edison lamps, and the error was not discovered until it was too late to complete further measurements with lower candle-power lamps in time for presentation in this paper.
Page 571 - The lighting design should aim to secure (1) sufficient illumination on the reading tables and book shelves to meet the demands of a wide class of readers of various ages and conditions of eyesight, taking into account the fine print in some of the books and the difficulty of reading titles of books in position on the shelves. Some of the books are worn...
Page 538 - Sufficient illumination on the reading tables and book shelves to meet the demands of a wide class of readers of various ages and conditions of eyesight, taking into account the fine print in some of the books and the difficulty of reading titles of books in position on the shelves. Some of the books are worn MARKS : ILLUMINATION OF CARNEGIE LIBRARIES V by frequent handling, and the titles become more or less obscured.
Page 555 - Fixture No. 6. the outside. Immediately over the lamps and inside the dome shades are placed prismatic reflectors. These fixtures are placed at the centers of the tables, with the tantalum lamps 20 inches above the table top, as shown in Fig. 30. The rectangular tables (Fig. 29) in the rear of the room, are illuminated by frosted 16 cp Edison lamps, equipped with reflectors of the same type as those used on the round reading tables.
Page 551 - Plan. and reflector being enclosed in a i6 inch crystal globe roughed on the outside. The height of the lamps above the floor is 12 feet 6 inches. The localized illumination is provided on the reading tables, stacks, bookshelves, etc., and may be used in whole or in 7<f Desk Reading Room w Secrf Seat Reading TtJtafes Fig.
Page 554 - H. in use, extend 9 inches beyond the edge of the case but when out of use, are swung over the top of the rack in order to leave Fig.
Page 553 - Glasswares A, B, C and D. 50 watt Gem lamps. The location of these reflectors is illustrated in the diagram, (Fig. 27).

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