454 



Acoustics. 



No. 53 543 



53 560. 1 : 5. 



53 543. 1 : 7. 



53 544 B. 



53 544 A. 1:8. 



53,543. Tuning Fork Apparatus as No. 53,592, F i g u r e, new Model, with fork-holder capable 

 of reciprocal rotation 



* 53,544. Large Tuning Fork Apparatus, K i g u i < s A and B, for subjective and objective 

 Demonstration of the Lissajous Curves, and for the graphical demonstration of the 

 vibrations of two Timing Porks (M. P. I, Figs. 80li and 807 [830 and 831]), with two 

 forks, two sliding weights, one cramp with glass plate, one style, two counterpoises and 

 a rase for the tuning forks 



The apparatus consists of two very massive tall stands to which thr tuning forks ;uv fixed. One 

 of the forks is movable on a sliding carriage. Both forks arc provided \\ith electromagnetic drive and 

 carry steel mirrors. The forks are very massively constructed and are tuned to < 1 L'S compound vi- 

 brations (ut 2 = 256 v. s). Tlie vibrations of the fork can lie placed parallel and perpendicular (o each 

 other. A sooted f^lass plate and style can lie clumped on the forks. The curves obtained can lie projected 

 direct. For obtaining different curves the forks listed on the next pai;c are employed. 



8. d. 



0.0 



18. 0.0 



* Can be used with the Projection Apparatus. 



Cl. 1108, 3377, 1142. 

 1141. 



