172 THE RESISTANCE OF VARIOUS TYPES OF BARGES 
No. 7.—Flat-iron shape one-fourth length, vertical sides. 
No. 8.—Ship-shape one-fourth length. 
No. 9.—Spoon-shape one-fourth length. 
The models were all tried at the same two displacements for each type, cor- 
responding to the “load,” and “light,” or 55 per cent of the load displacement of 
No. 8, with the exception that Nos. 1 and 9 were tried at the same load draught 
as No. 8 on account of their relatively small displacement. There was, therefore, a 
variation of draught in most cases, as shown in the following table:— 
Taste I. 
No. 5 # light # toad (Ey light ay load 
100 100 
Dessert 4.41 7.32 4.857 136.5 223 
Mocsaad 4.41 8.5 4.857 136.5 247 
Sioeouac 4.41 9.5 5.41 136.5 247 
Bere 4.41 9.86 5.6 136.5 247 
Bisetaes 4.41 7.45 4.56 136.5 247 
(eee 4.41 8.72 5.1 136.5 247 
Uooovoor 4.41 8.72 4.857 136.5 247 
8 4.41 8.5 4.857 136.5 247 
Ckwoade 4.41 7.31 4.857 136.5 223 
Each model was tested in four different depths of water, or corresponding to 
a vessel 150 feet in length, these would be 6 feet, 9 feet, 12 feet, and “deep water.” 
The results are shown in Figs. 4 to 7, Plates 85 to 88. 
In the shallower water resistance curves tend to arrange themselves into two 
groups, the forms with the straight sides having, on the whole, greater resistance 
than those where the sides are curved. 
The ship-shaped form No. 8 is uniformly good, but it is followed closely by 
the scow form No. 2. 
Number 7 appears at its best in very shallow water, otherwise it does not 
seem to be as good as some of the others. 
Numbers 1 and g (long rake) are easily driven forms, but do not have the same 
amount of displacement at the load draught as the others. The effect of square 
versus round corners may be seen by comparing these two types. 
The form with the circular end (No. 3) shows up fairly well in very shallow 
water, as it is the one of greatest displacement and consequently floats at a lighter 
draught. In fact, the clearance between the bottom of the vessel and that of the 
river appears to have a marked effect in the resistance of any form. 
Number 5, on the whole, appears to be rather a poor form. 
