Let be a set and σ be a positive function on . We introduce and study a locally convex topology β 1 ( , σ ) on the space 1 ( , σ ) such that the strong dual of ( 1 ( , σ ), β 1 ( , σ )) can be identified with the Banach space (c 0 ( , 1/σ ), · ∞,σ ). We also show that, except for the case where is finite, there are infinitely many such locally convex topologies on 1 ( , σ ). Finally, we investigate some other properties of the locally convex space ( 1 ( , σ ), β 1 ( , σ )), and as an application, we answer partially a question raised by A. I. Singh ['L ∞ 0 (G) * as the second dual of the group algebra L 1 (G) with a locally convex topology', Michigan Math. J. 46 (1999), 143-150].