Fig. 15.-Indirect lighting of book stacks without the use of fixtures.

Fig. 16.-Indirect illumination in newspaper and magazine room of a public library.

Fig. 18.-Library reading room lighted by the indirect system. (Facing Figs. 15 and 16.)

Fig. 19.- Indirect illumination in a branch library in a large city.

Fig. 20.-Church illuminated principally by means of large central lighting unit.

Fig. 23.-Luminous bowl, indirect illuminating installation in a church.