A short article appeared in the technical literature¹ and is reproduced here in its entirety:

"The demand for miniature incandescent lamps is increasing. Not only are they used for purposes of ornamentation and decoration, but for numerous ingenious and useful purposes in the household and other places. At social gatherings these lamps may be placed among loose flowers in bouquet baskets or vases of real or artificial flowers. The accompanying cuts, Figs 1 and 2, represent a small socketed Edison lamp and the receptacle designed to receive it. The base of the receptacle is made of hard fibrous material, the connections being of polished brass. It is shown of actual size in the cut (referring, of course, to the original picture). Fig. 3 shows a 'bunch' or 'spray' fixture. These sprays are fitted up with any number of lamps of any candle power so that they may be used in a basket or vase to contain flowers. As a rule the bunch is set in the basket or vase and the flowers filled in around the lamps. A most pleasing and artistic effect can in this way be produced. Fancy colored glass shades are also used with these fixtures. These not only heighten the effect of the lights among the flowers, but they keep the plants from resting upon the lamps and thus prevent their withering. The lamps are made by the Edison Lamp Co. in Harrison, N. J."

Reference
1) "Miniature Edison Lamps", Western Electrician, Vol 5, Oct 19, 1889, pg 209.