TriDisactioiis Society Nin'dl .Irclillrcls iiiul }fiiyiiic Riufinccrs. Vol. 26, fgi8. 



Plate 



Ti> illiislralc /ni/^cr on " rrof/rcss in 'I'lirhiiic Ship I'roj^iilsioii, 

 hy h'raiicis 1 1 oiltihinson . f'.scj., I'isitor. 



o 



oi 



o 

 O 





