HINTS TO CORRESPONDENTS. (5) M. H. F. asks for a formula of a L. R. D. - Lightning rods well E. M. C. asks : Is there any rule or TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Granted September 25 1888 AND EACH BEARING THAT DATE. Toilet case., scientific american, 1888-10-13

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HINTS TO CORRESPONDENTS. (5) M. H. F. asks for a formula of a L. R. D. - Lightning rods well E. M. C. asks : Is there any rule or TO INVENTORS. INDEX OF INVENTIONS For which Letters Patent of the United States were Granted September 25 1888 AND EACH BEARING THAT DATE. Toilet case., scientific american, 1888-10-13

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