Practical Features of Telephone Work
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This also applies to transmitters of the "ball" type.
Any screws used to hold the carbon block to the arm should be insulated from the granules, unless specially intended to transmit part of the current; but it is better to have the cur- rent pass from the disk through the granules and to the plate directly, without going through any other conductor than the carbon, as an exposed screw in the base of the carbon block has a tendency to inake the transmitter uncertain in its action.
The carbon di...sk should be electroplated on the front side and contact with the battery made by means of a fine wire sol- dered thereto.
The induction coil to be four inches in length, and the iron core to consist of a bundle of fine, soft iron wires, laid longi- tudinally, not to exceed 5-16 inch in diameter, the iron wires composing the bundle not to be larger than 22 B. & S. in size.
The primary coil to be wound to a resistance of .1.5 ohms, and the secondary to 225 ohms, the winding to be as nearly uniform as possible, the diflf;rence between any two coils not to exceed 4 per cent.
What to read after Practical Features of Telephone Work?
You can find similar books in the "Read Also" column, or choose other free books by Dobbs, A. E to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This also applies to transmitters of the "ball" type.
Any screws used to hold the carbon block to the arm should be insulated from the granules, unless specially intended to transmit part of the current; but it is better to have the cur- rent pass from the disk through the granules and to the plate directly, without going through any other conductor than the carbon, as an exposed screw in the base of the carbon block has a tendency to inake the transmitter uncertain in its action.
The carbon di...sk should be electroplated on the front side and contact with the battery made by means of a fine wire sol- dered thereto.
The induction coil to be four inches in length, and the iron core to consist of a bundle of fine, soft iron wires, laid longi- tudinally, not to exceed 5-16 inch in diameter, the iron wires composing the bundle not to be larger than 22 B. & S. in size.
The primary coil to be wound to a resistance of .1.5 ohms, and the secondary to 225 ohms, the winding to be as nearly uniform as possible, the diflf;rence between any two coils not to exceed 4 per cent.
What to read after Practical Features of Telephone Work?
You can find similar books in the "Read Also" column, or choose other free books by Dobbs, A. E to read onlineMoreLess
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