Transactions Society Naz'ol Architects and Marine F.iuiineers. P^ot. 2^, iQif). 



Plate 5. 



To illustrate paper 011 ".Icrodytiaiiiical Experiments upon a Yacht's Mainsail," 

 by Professor H. A. Everett, Member. 



Aerodynamical Balance in Position Below. Floor of Tunnel. The Vertical Shaft 

 Projects Up Through Floor of Tunnel and Carries Model. 



