138 



APPENDIX. 



TABLE IV. Extreme radius = 10; Depth of float = 2*5. 



Let us now apply these tables to the case of the e Salamander,' for which the calculation by 

 the other method is given in pages 129 and 130. The depth of the floats, reduced to the 

 scale of the tables, becomes 2*38, the immersion 5*238, and the radius of the rolling circle 

 7*247, as at page 134. In Table III., under the immersion 5*25, and opposite to the numbers 

 7*2 and 7*3 in the first column on the left, we find 0*532 and 0-533, of which we take the 

 mean 0-5325, and in Table IV. we find the numbers 0'544 and 0'546, of which the mean is 

 0*545. The difference being 0*0125, we make the proportion 0*5 : 0*0125 :: 0*38 : 0*0095, 

 which, added to 0*5325, gives 0*542 for the proportion of the depth of the float contained 

 between its upper edge and the centre of propelling effect, so that the distance of this point 

 from the axis of the wheel, or z, is equal to 9*355 ft. We have thus, 



