Smithsonian Report, 1919. — Nutting. 
Plate 5, 
in ^1 
"ti 
LM— 'k:.*^. ^ ^1 
hIBml^k' ' ' ' jnB ^^^I 
^^mm' 
"^^^m 
rt^ fl 
iSZ^^^VH 
■^■ViK /"' 
Bow View OF the HD-4 on Her Cradle, Showing Starboard and Port 
Hydrofoils. 
Rear View of the HD-4 in Her Shed. Showing Stern Hydrofoils. 
