Mabch 17 1899.] 



SCIENCE. 



389 



with an eyelet (not shown), to actuate 

 other apparatna §§8, 25, 24. 



The larger tube FF' carries a U-shaped 

 wide gutter of tin plate K in front, soldered 

 to FF' and adapted to ride on one of the 

 front series of eccentrics. The section 

 through I is seen in thfe auxiliary figure I, 

 showing all the sectional parts E, F, K in 

 their relative positions. K is 7i" long and 

 must be carefully placed so as to be adapted 

 to the various types of wave motion. Its 

 position in figure is in the scale specified. 



The rear of the tube FF' is fitted with a 

 similar set of gutters of tin plate, ilf and L, 

 meeting at right angles with their concave 

 sides rearward and downward. This right- 

 angled gutter is adapted to ride on one of 

 the cams of the rear axle, the bearing be- 

 ing on 31 or L, or both, as the case may be. 

 The section is shown in II. The gutter M 

 terminates in a flat fork, securing and guid- 

 ing a small vertical roller 0, as shown in 

 the figure. 



common cross rod (seen at S in Figs. 4 

 and 6), and they are adjusted as to tension 

 and direction by sliding both ends of the 

 rod S along oblique notched laths of tin 

 plate T on both sides of the machine. The 

 springs themselves appear clearly in Fig. 4, 

 and the riders in different positions in the 

 other figures. The cams in rotating run 

 within the loop of the elastic staple P. and 

 suflQcient breadth must be given for clear- 

 ance. The springs should be as light as 

 practicable to obviate excess of friction on 

 the axle. Steel wire No. 23, wound to a 

 closed helix about l/2"in diameter and 1/2" 

 long, is suitable. 



The length of the gutter L is 6", of M to 

 the end of the roller 7i", and they are sol- 

 dered toJ^' to correspond with K. 



As regards sure guidance and ease 

 of adjustment, springs placed in the 

 rear of the machine are to be preferred. 

 With less advantage they may be placed 

 between the axles, as was done in my 



^j jTig. S. _± jT 



J^icfJO. 



Figs. 7 to 10. Details. 



To bind the levers firmly down upon the 

 rear cams, a long staple of thin steel wire 

 (No. 16) F is attached about 5" below FF'. 

 As shown in plan in Fig. 9, this is about 

 5" long and pulled downward to the rear 

 by a helical spring the action of which is 

 indicated by the arrow in Fig. 8. The rear 

 ends of all helical springs are soldered to a 



earlier apparatus. Levers heavier at their 

 rear ends are desirable, and in some exper- 

 iments, if not in all, the machine should be 

 tipped up in front. Waves may then be 

 sent along the axis with considerable veloc- 

 ity. 



ACTION OF THE MACHINE. 



6. Method of Compounding. — Very little 



