A recording device for indicating (a) the flow of water in pipes, (b) the speed of boats (1909)
Baldwin, Frank Boyd, Hiveley, Oscar George · leaf 28
istons might be satisfactory inthat respect. Of the four pistons that were tested, one was foundto be entirely suitable. A second one was selected, but it requir-ed a new piston head to make it efficient. These two indicator pis-tons were next placed in a wooden frame as is shown in the sketchon… … 3kefch showing orroncjeimenf ofWooden Frame for Inaicdtor Pi5fon5 and Exten^omettr
