Details
A silver-painted Watts helix current meter,
with propeller, geared movement with electrical attachment, the tail with three fins, with mounting post and various accessories, in the original mahogany case -- 20in. (50.8cm.) wide
See Illustration
with propeller, geared movement with electrical attachment, the tail with three fins, with mounting post and various accessories, in the original mahogany case -- 20in. (50.8cm.) wide
See Illustration