Figure 13. — Feuss' "balance barometer after 

 Samuel Morland," 1880. Wren probably was 

 the originator of this type of instrument. 

 (From Loewenherz, op. cit. footnote 28.) 



Figure 14. — Marvin's mechanical registering 

 barometer, 1905. This instrument was for- 

 merly in the U.S. Weather Bureau. {USNM 

 316^00; Smithsonian photo ^6y^o-E.) 



