AN IMPROVED GRAMOPHONE.

Hokitika Guardian, 11 April 1925, Page 1

AN IMPROVED GRAMOPHONE.

- , . —<gSfru THE PLEATED DIAPHRAGM. “ The Voice,” the monthly review mi of the Gramophone Company, in a rese cent issue says that for years experts in have worked unceasingly effecting imo- provements of a new principle, the ri- pleated diaphragm which is creating a a- sensation in the trade as it represents ce Mich a complete departure from all acie cetped ideas of graniaphone constructy Lion. r, Like many other important inven--2- tions. the pleated diaphragm was origic inn Ily suggested by a casual observa:e tion. .11. Lumiere, who was conducting it certain experiments relative to acousin ties, was struck hv the peculiar sound ?e produced by percussion at tho centre > of one of the common fans made of a t- large sheet of pleated paper, the folds it of which arc fixed together at one end. !r He at once commenced to seek for the i- cause of the phenomenon, and further is observations led him to believe that the n sound resulted from the laet that r- when the fan is opened the rectangles If formed by the folds have one end in h the same plane as the general surface e of the diaphragm, while the other end i- i s perpendicular. It then occurred to y him to apply his discovery to the e gramophone. Countless experiments a were made to determine the most suit--0 able size of the diaphragm used, the y nature of the paper, the. width ol the i. folds, and tho manner in which a o gramophone needle should he made to '■ carry tho vibrations from the groove 0 of tiie record to the centre of the dial' phragm. •f He succeeded in producing a dia- !- phragm which gave excellent tone and <1 volume, while there was a marked abL sc nee of distortion, the even diffusion c of sound from the surface of tho diaphragm being particularly pleasant to the oar. For over four years the s experts at the factory have been work- •- iug hard, simplifying mechanism, try- (' ing this and that method of support--11 ing the pleated diaphragm, until their d efforts were rewarded with success, h 1L is the exclusive privilege of “His !s Master’s Voice” accredited dealers to lS supply this wonderful invention to the >’ public, it being the most important 0 gramophone discovery that has yet •' been made. 11 This now and latest improvement is s now on view at the local gramophone l_ dealer’s show room, where the proprietor Mr A. AY. Yarrall will he pleas-