440 



Acoustics. 



No. 53418 



53418. 1 : 5. 



53420. 1 : 5. 



53421. 1 : 5. 



53425. 2 : 3. 



53426. 1 : 8. 



53429. 1 : 12. 



53.418. Recording Tuning Fork C = 128 compound vibrations (at., = 256 v. s.), with style, 

 Figure 



l>Yr<>rding Tuning Forks with electric drive, chronographically, see p. 455. 



53.419. Shoe with Writing Point for Fork No. 53,382 (M. T. Fig. 36) 



53.420. Ivory Hammer for striking Tuning Forks, Figure 



53.421. Hammer with rubber strikers, Figure 



53.422. Metal Drum Stick with leather discs 



53.423. Cello Bow 



53.424. Bass Fiddle Bow, can be used for experiments with heavy tuning forks 



53.425. Tuning Fork Exciter Clamp after Db'lger, F i g u r e, to enable the tuning forks always 

 to be vibrated to the same intensity, with screw adjustement, rule, and in box . . . 



Vibrating Strings, Plates, Bells, etc. 



53.426. Monochord, Figure, useful string-length 1.2 m, with 3 strings, 2 with pegs and 

 one with weight for stretching, with centimetre scale, movable bridge and damper clamp. 

 of polished mahogany (only two strings are shown in illustration), without weights . 



53.427. -- idem, of alder wood, same .-i/.e as above, simpler pattern 



i S. (I. 



0.18.0 



0. 3. 



0. !). 



0. !>. o 



0. (J. 



0. 4.0 



0. ;. u 



1. 15.0 



1. 11'. 



1. 4.0 





cl. 1124,3378,4519, 51)27, 

 1149, 1150. 



