Report Brit. Assoc ISOtX 



Plate, 1 



Fiq.I. 



Half Tfater-7ine.s of the .MocM^s: 





Modd A. 

 Model B. 



ajoo gjgo 2^0 z<fio B\fio afio 



Model A 



20 o\to j\eo 3\so 4\oo 4^0 4\ to 



Ydoci^ in /fat pe/^ minute. 



Vdadfy iri feet per niinuti- . 



Mj.d. 

 jJi'ffQ-raf>i.f of 3 ft. .Models. 



Model A. 

 Mode/ B. 



VdocUy irv feet per iniruUU . 



