This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
Having a talking machine of an old model with a tapered horn I decided to change it into a more modern type, and this was accomplished as follows: An auxiliary base was constructed of 1/2-in. wood on which to set the part which revolves the disks. The inside of this base is so constructed as to form a horn or sounding box. The two sides and sloping bottom of the horn-part are made of 1/4-in. wood. The form of this box is shown in Fig. 1. The dimensions should be determined according to the size of the talking machine.
Ill: The Horn or Sounding Box is Constructed in the Auxiliary Base and the Part for Connecting the Sounding Tube to the Box Consists of Ordinary Gas Pipe Fastened with a Clip at the Back
The connecting parts to the original horn were turned downward, as shown at A, Fig. 2, with the opening entering a piece of ordinary gas pipe of sufficient length to allow an elbow with a nipple to enter the auxiliary base. The pivot-holding device for connection A is shown at D. The parts are attached to the box with a clasp. E, and with three screws in the nipple C, the end view of which is shown at
F. The talking machine is placed on the auxiliary base as shown in Fig. 3. This construction produces a talking machine on the order of a cabinet machine without the tapering horn.- Contributed by H. W. J. Lomglatz, Harrisburg, Pa.