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 {{Catalog History}}
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-The {{Title|General Radio 874-LBA Slotted Line}} was introduced in {{Catalog O}} and remained available through {{Catalog S}}.
+The {{Title|General Radio 874-LBA Slotted Line}} was introduced in {{Catalog O}} and remained available through {{Catalog S}}.  Its function is to observe the electric field along the inside of a coaxial transmission line using a carriage-mounted probe moving along the line.
-The Type 874-LBA Slotted Line is used to observe the electric field inside a coaxial transmission line, the slotted line. Using its carriage mounted probe standing waves on the slotted line can be examined.  By observing minimums and maximums known as the standing-wave pattern the characteristics of the circuit connected to load can be determined. Applications include determination of the frequency applied to the line, measurements of antennas, components, coaxial elements, and networks. The 874-LBA is an update of the [[874-LB]]. They feature improved accuracy and carriage construction. The new carriage removes it's drive control to a fixed position at the load end. The carraige is now controlled by a nylon cord and series of pulleys. The 874-LBA is supplied with a protective wooden case along spare nylon cable and crystal detector.
+By observing minima and maxima of a standing-wave pattern, the characteristics of a circuit connected to the load side of the line can be determined.  Applications include frequency measurement and analysis of antennas, components, coaxial elements, and networks.
+The 874-LBA is an update of the [[874-LB]], featuring improved accuracy and carriage construction. The redesigned carriage is controlled by a nylon cord and a series of pulleys to remove its drive control to a fixed position at the load end.
+The 874-LBA was supplied with a protective wooden case, a spare nylon cable, and a crystal detector.
 ==Specifications==
-* '''Characteristic Impedance:''' 50 ohms, ±0.5%.
+* '''Characteristic Impedance:''' 50 Ω, ±0.5%
 * '''Scale Accuracy:''' ±(0.1 mm +0.05%)
-* '''Frequency Range:''' 300 MHz to 5 GHz, At 300 Mc the slotted line covers one half wavelength
+* '''Frequency Range:''' 300 MHz to 5 GHz. At 300 MHz, the slotted line covers one-half of a wavelength.
 * '''Constancy of Probe Penetration:''' ±1½%
 ==Links==
-* [[Media:GR Exp 874-LBA 12_1954.pdf|Experimenter describing Type 874-LBA 1954]]
+* [[Media:GR Exp 874-LBA 12_1954.pdf|Experimenter December 1954 describing Type 874-LBA]]
 * [[Media:1N Series Microwave Diode Data Sheet.pdf|1N23B Microwave Diode Data]]
-* [https://www.youtube.com/watch?v=DovunOxlY1k&t=668s AT&T Archives Wave Machine Tutorial]@ YouTube
+* [https://www.youtube.com/watch?v=DovunOxlY1k&t=668s AT&T Archives Wave Machine Tutorial] @ YouTube
 ==Photos==