Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 TELEPHONE RECEIVERS 229 Fig. The mass of the diaphragm is represented by mo. The com- pliance and mechanical resistance of the diaphragm are designated as Cmo and Tmo- The back of the diaphragm is enclosed, forming the com- pliance Cmi due to the resulting cavity. This cavity is connected to the recess in the receiver handle by a hole in the plate. A special silk covers this hole, forming the mechanical resistance r^i and the mass mi. The

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