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The Ebright Azimuth is the point with the highest benchmark monument elevation in the U.S. state of
The Ebright Azimuth is the point with the highest benchmark monument elevation in the U.S. state of Delaware
Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
. It is marked with a geodetic benchmark monument and has an elevation of above sea level
Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...
. The only state high-point with a lower elevation is Britton Hill in the state of Florida
Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...
at above sea level.
Description
The Ebright Azimuth is located about north of downtown Wilmington,Delaware
Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
, in far northern New Castle County, approximately 500' horizontal distance from the Delaware-Pennsylvania border. It is near Concord High School, to the north of Naamans Road, at the middle of the intersection of Ebright Road and Ramblewood Drive. This is an entrance to the Dartmouth Woods development.
Surveying by Delaware Geological Survey personnel indicates that the mobile home park just west of Ebright Road is at least higher than the benchmark.
Ebright Azimuth is named after James and Grant Ebright, who owned the property on which the benchmark was placed. An azimuth
An azimuth (; from ) is the horizontal angle from a cardinal direction, most commonly north, in a local or observer-centric spherical coordinate system.
Mathematically, the relative position vector from an observer ( origin) to a point ...
is an angular measurement in a spherical coordinate system.
Since the schematic photograph was taken the blue and yellow monument sign has been moved across the street closer to the geodetic marker. A curb extension has been installed, and the area around the sign has been modestly landscaped.
Radio tower history
The self-supporting radio tower just south of the benchmark was constructed in 1947 by Western Union as part of a historic C-bandmicrowave radio relay
Microwave transmission is the Data transmission, transmission of information by electromagnetic waves with wavelengths in the microwave frequency range of 300 MHz to 300 GHz (1 m - 1 mm wavelength) of the electromagnetic spectrum ...
system that linked New York City
New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...
and Washington, D.C. This site was assigned the name "Brandywine" in recognition of Brandywine Creek located several kilometers to the west and was licensed with the call sign
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique identifier for a transmitter station. A call sign can be formally as ...
KGB29.
Western Union's engineers specified a heavy-duty prefabricated fire tower structure, which allowed the microwave transmitters and receivers to be installed inside the cab. "Dish" antennas, mounted behind the window openings, were aimed towards the adjacent relay stations at Mt. Laurel, New Jersey, to the northeast, and Elk Neck near Elkton, Maryland
Elkton is a town in and the county seat of Cecil County, Maryland, United States. The population was 15,776 at the 2020 census, up from 15,443 in 2010. It was formerly called Head of Elk because it sits at the head of navigation on the Elk R ...
, to the southwest.
Like most of their early microwave relay sites, Western Union decommissioned the Brandywine installation near Ebright Azimuth as more-reliable broadband fiber
Fiber (spelled fibre in British English; from ) is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often inco ...
systems were developed. The structure now supports several VHF and UHF land mobile radio antennas.
See also
* * *List of U.S. states by elevation
A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, but ...
References
External links
* {{U.S. State Highest Points Landforms of Delaware Landforms of New Castle County, Delaware Highest points of U.S. states