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and having it connected both the center and outer edge of the glass, the strain on the glass caused by the cylinder re- volving, and pulling on the recording pcint is done away with and the glass is free to act in the direction of the vibrations only. This recorder is now included with all style Phonographs except the Gem. If it is purchased separately the price is I5.00 and it may be obtained from any dealer. When this recorder is used, it is possible to use a more sensitive glass than could be used with the old style and therefore the result is a louder record. As the beginner will have only one recorder to work with, (and not a number which he might adjust for differ- ent classes of work) it is advisable to adjust the recorder for *11 work and to do this he must experiment with the different thicknesses of glass diaphragms until he strikes a happy medium. It is hardly possible for the writer to tell exactly what size to use as different conditions prevail for different work; but for the old style recorder it is generally found that a number 6 (or .006) glass is the best to use and the new style recorder can use a number 4^ (.0045) or 5 (.005). In the new recorder care should be taken that the sapphire arm is firmly cemented to the glass at both the center and outer edge. It is also important that the recording point should be set at the exact center of the glass; for if it is not in the center, it will cause the point to jump just as a slate pencil will jump when held per- pendicular and run across a slate. Stratena should be used for cementing the arm to the glass, and this will also serve for cementing the glass into the recorder weight. ( To be Continued).