Sargent-Welch Catalog 124: Scientific Laboratory Instruments, Apparatus, & Supplies. Skokie, IL: Sargent-Welch Scientific Co., 1976. Heavy hardcover, 1460 pages, thousands of b&w illus. Sargent-Welch is one of the nation's leading suppliers of science education products. Vast catalog of thousands of pieces of vintage lab and scientific gear, large and small.