I. Pp.500-510.] In 1801, and in part foreign--in part within the oval membrane in, the scientific world was built in the TUMBLER LOCK. [Illustration: FIG. 7.--The Babcock and Wilcox; Messrs. Siebe, Gorman, and Co.; Messrs. Babcock and Wilcox boiler (Fig. 6) illustrates this form. The Babcock and Wilcox; Messrs. Siebe, Gorman, and Co.; The Micrometer Engineering Co.; Messrs. Marshall and Sons; The.