TIDE-PREDICTING MACHINE NO. 2. 21 



collar and resting upon the flange, Jias sunk into its upper surface a 

 recess, h, which is filled by the flange of the collar <7. The latter 

 is free to move vertically, but prevented from turning by a small 

 steel screw reaching into a vertical groove, a, in the collar A. The 

 lower surface of the collar (7 is slightly ''dished"; after being fitted 

 accurately into the recess h, it is split twice, at right angles, nearly 

 to the top. When the milled nut D is screwed down with a small pin 

 wrench the edge of the collar is pressed against the edge of the 

 recess h with such force as to make slipping practically impossible. 



Arrangement of components. — The arrangement of the components 

 in relation to each other as regards location was considered carefully 

 with the object of reducing flexure and friction to a minimum. As 

 far as economy in space would permit the components with the 

 largest amplitudes and greatest speeds were placed nearest to the 

 free ends of the summing chains and connected most nearly direct 

 with the main driving shaft, while the others were placed farther 

 toward the fixed ends of the chains and away from the source of 

 power. The product of the maximum amplitude and the speed of 

 each component was taken as a measure for assigning its place. 



Viewing the machine from the time side (plate 6), the components 

 are arranged in' the following order, beginning at the left or front 

 and going toward the right or rear: 



Upper Range, 

 front component framb. 



"2"' 2' ^2' 2"' ^4 



REAR COMPONENT FRAME. 



Driven by front vertical shaft. 



M^, MK„ S^, MN, v^, S^, /i2, 2N. 



Driven by rear vertical shaft. 



00, X 2, ^S*!, ifj, Ji, Mm, Ssa. 



Lower Range. 



FRONT component FRAME. 



M^ S. K, ,, 

 "2 ' "?' F' ^'• 



REAR COMPONENT FRAME. 



Driven by front vertical shaft. 



(MS)^, J/s, Z2, 2MK, L^, M^, 2SM, P^, 



Driven by rear vertical shaft. 



20, R^, ^2, Q„ pi, Mf MSf Sa. 



