[PrevPage] [Next] [INDEX ]  Volume 1   22 Feb. 1876    Page 19  [Source] [ NOTES ]
  1. Clamped steel spring Arrangement as in (1) save that a steel-spring S was clamped to the pole B (Fig 5). Upon pressing S into contact with P crackling noise was heard. Allowing S almost to touch P quite a loud musical note was audible (the unison of the transmitting Instrument) accompanied by other very high and shrill notes. Upon gradually shortening the vibrating length SB it was found that the loud fundamental note remained the same but the upper tones became more and more shrill until one of the octaves of the fundamental was reached ­ when the spring SB vibrated as a whole producing the unison of the transmitting instrument loudly enough to be heard (with attention) all over the room. The vibration was visible.

    Battery power used {Primary circuit - one cell; Secondary circuit - two cells.

  2. Arrangements the same as for 5 but only one cell of battery on the secondary circuit. Sound much louder than for 5.

  3. Arrangements the same as for 5­but no battery upon the secondary circuit. Sound as loud if not louder than that in (6).
[PrevPage] [Next] [INDEX ]  Volume 1   22 Feb. 1876    Page 19  [Source] [ NOTES ]