The 7144-1.0 is a decade resistor from Solar. A decade resistor is a type of electronic test equipment with a series of resistors, inductors, or capacitors to simulate specific electrical values. An engineer can replace any standard-value component in a circuit with a used or refurbished decade resistor because of its ability to configure to almost any value.
The Solar 7144-1.0 is a 50 W, 1 Ω resistor used in Test Method RS01 to measure the current in the Solar Type 7429-1 Radiating Loop Antenna. This device is mounted in a special housing with terminals for a voltmeter. Since the resistance value is 1 Ω plus or minus 5%, the voltage measured on these terminals is equal to the current flowing in the circuit, up to 100 kHz.