Multiple Electrode

To remedy this difficulty the so-called multiple-electrode transmitter was brought out. This took a very great number of forms, of which the one shown in Fig. 39 is typical. The diaphragm shown at 1 , in this particular form, was made of thin pine wood. On the rear side of this, suspended from a rod 3 carried in a bracket 4 , were a number of carbon rods or pendants 5 , loosely resting against a rod 2 , carried on a bracket 6 also mounted on the rear of the diaphragm. The pivotal rod 3 and the rod 2 , against which the pendants rested, were sometimes, like the pendant rods, made of carbon and sometimes of metal, such as bra . When the diaphragm vibrated, the intimacy of contact between the pendant rod 5 and the rod 2 was altered, and thus the resistance of the path through all of the pendant rods in multiple was changed. IMG:384091999325875926_fig039_t.gif.png:Illustration_ Fig. 39. Multiple-Electrode Transmitter Fig. 39. Multiple-Electrode Transmitter View full size illustration. A multitude of forms of such transmitters came into use in the early eighties, and while they in some measure remedied the difficulty encountered with the Blake transmitter, i.e. , of not being able to carry a sufficiently large current, they were all subject to the effects of extreme sensitivene , and would rattle or break when called upon to transmit sounds of more than ordinary loudne . Furthermore, the presence of such large ma es of material, which it was nece ary to throw into vibration by the sound waves, was distinctly against this form of transmitter. The inertia of the moving parts was so great that clearne of articulation was interfered with.