A NEW CURRENT WEIGHER, ETC. 



513 



From the above table and formula (2), p. 509, the value of M, MI for the left 

 suspended cylinder and the lower helices on the left-hand fixed cylinders can be 



obtained, viz. : 



= 12980-562 (18). 



To determine the corresponding quantities for the remaining part of M L and for 

 those of M R the quantities given in Table X. are required. 



TABLE X. Calculation of Increment Coefficients q, r, and * [Equations (3) and (17)]. 



Formula (3), p. 509, Section 9, may be written 



e = Me - dA.+ Me - da+ M. - dx 

 A. a x 



and making use of the values of M, q, r, and s, from Tables IX. and X., we get 



' =- 1490-5 rfA + 51967 da-766'Qdx'} 



,' = - 754-8 eA + 2677-6 da-403'Odx 1 .... (20), 



/ = - 561-9 



where 



.... 

 ) 



M.' = 4M., M.,' = 2M^, Me,' = 2Me,, 



and dA., da, and dx are increments of A, a, and x respectively. 



In cases where dA., da, and dx, are the same for all the windings involved in one 

 value of M, M,, the equations (20) may be combined, thus giving 



d(M t -M 1 ) = - 1683-4 dA.+ 3335'6 da-W2dx .... (21). 

 For the helix GH (fig. 21) and current sheet a,a', we have 



dA. = -0-00053, da = 0, dx = 0, 



VOL. ccvu. A. 



3 -M,) = + 1683-4 x 53 x lO' 6 = 0'892. 

 3 u 



