Telegram Telegraph linemen would have utilized the Lineman’s Galvanometer as their primary diagnostic instrument. usually used in conjunction with a battery to verify continuity or to check for current on telegraph circuits. An indication sits in front of the dial on a horizontal axle, and between two coils inside is a magnetized needle. Also referred to as a Q&I or linesmen detector. They typically had two sensitivities: an intensity coil, or I coil, with a high resistance for measuring voltage, and a quantity coil, or Q coil, with a low resistance for measuring current.
An excerpt from Professor Jamieson’s 1897 book “Elementary Manual of Magnetism and Electricity” is provided below. During his time at the Elswick Institute studying Electrical Engineering in 1900, my grandfather utilized this particular book.
It is recommended that elementary students be able to quickly identify the names and functions of both the instruments used in the classroom and laboratory as well as the corresponding instruments used in the real-world applications of electricity. In the following figure, we have depicted an exterior view of the form that the galvanometer takes when supplied to the Telegraph or Telephone Line-Man, or to the Electrical Engineer, as a simple portable detector or rough-and-ready measurer of the presence, direction, and strength of electric currents.
To use such apparatus, the operator simply needs to connect the outstanding terminals to the two ends of a circuit (or one terminal to the Earth, the other terminal to the telegraph line, or one end of the leading wire) in order to determine whether a current is flowing through the circuit or not. If he notices any deviation of the needle (to the left or right), he therefore knows the direction of the current from a prior test, and he may guess the strength of the current based on the number of degrees the needle deviates.
- To accommodate circuits of varying lengths, the three terminals on this instrument are linked to two sets of coils: one set is a thick wire with a short length, while the other is a finer wire with a longer length.
**A detailed explanation of the technical meaning of the phrase “Earth” as used by electricians will follow. In this context, it could refer to a connection made between the galvanometer and a gas or water pipe, or it could refer to a plate submerged in a pond or moist soil.
Martin Harrison sent me some equipment that had belonged to his father, a chartered electrical engineer, including this beautiful antique meter. He gathered antique electrical test equipment as well as antique clocks because of his name, John Harrison. Martin believed that his father would have been happy that his belongings found a new home and owner.
After giving it a quick clean and polish, I discovered that the pointer deflects when the meter is powered on and that both windings are in good condition. It must be utilized in a vertical orientation.
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