expla:n^ation or plates. 



Plate 1. 



General view of houseboat with floats attached. The hatching boxes sunk in 

 place covered with white shades. 



Plate 2. 



General view of the plant from the outer rear corner — starboard side. In 

 foreground one of the cars shows the propeller shaft and faint indication of 

 propeller blades in water. The shaft coming through the side of the engine- 

 house passes into the extension device seen just outside the first shaft-hanger, 

 then connects with the longitudinal shafts. Location of rearing cars and the 

 alleys with barrels. 



Plate .3. 

 Starboard side, looking aft. Shafting system and general arrangement of cars, 



Plate 4. 



One of the cars of the inner float with propeller in motion, showing blades 

 faintly through the water. From propeller the shafting may be followed back 

 to the universal joint in the foreground where it joins the transverse shafting on 

 the houseboat itself. There are shown in this photograph the following struc- 

 tures: propeller shaft 1; sleeve coupling 2; longitudinal shaft 3; adjustable shaft- 

 hanger 4, 7 ; gear trains from longitudinal to transverse shafts 5 ; transverse hori- 

 zontal shaft of float 6; ball joint connecting shaft with that of the houseboat 8; 

 edge of rearing box 9; brace across corner of rearing box 10; holding-down plank 

 mortised into corner post 11; shaft beam. 



Plate 5. 



Rearing car raised and held up by portable windlass. Showing slot in end of 

 car through which, when car is raised, the longitudinal shaft runs 1 ; longitudinal 

 shaft 2; side window of car .3; portable "horse" and windlass 4. 



