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Additional Plans for Aerial Ship.
[[image drawing of a device for testing resistance of the envelope - circle on left with 1 in center - circular connection with 2 inside - arc drawn with a 4 next to it - double lines (arm) to the right with a 5 under it -  -- upward arrow to the right with a 3 next to it -  with another arrow drawn connecting to the right of the first arrow ]]

This is a device for testing the various forms of heads for the envelope in order to obtain the one of least resistance.  The large wheel, 1, drives the small one, 2, at a high rate of speed, causing the head, 3, under evamination to revolve in a circle.  The arm, 5, having a joint on 2, the resistance is measured by the scales 4.

[[image drawing of a device to test propellers - fan with rod drawn to the right with two dark connections - two discs to the right on rod indicated by 1 and further to the right is a rectangle with vertical lines in it with a 2 indicated above]]

This is for testing the most effective propeller.  The shaft disc at, 1, pressures against the disc of a pair of scales which register the push.

Berlin, June 2, 1883

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