The "long cubit" is a historical unit of length used in various ancient cultures, including ancient Egypt and Mesopotamia. It was a longer version of the standard cubit, which was used for measuring length in these civilizations.
The exact length of the long cubit could vary depending on the region and time period, but it was typically longer than the standard cubit. In ancient Egypt, for example, the long cubit was approximately 52.3 centimeters (about 20.6 inches), while the standard cubit was around 45 centimeters (about 17.7 inches).
These cubits were often used in construction, architecture, and other applications where length measurements were needed. The long cubit was particularly useful for larger and more precise construction projects.
It's important to note that the long cubit is a historical unit of measurement and is not part of modern measurement systems like the metric system or the imperial system.
The term "long reed" does not refer to a standard unit of measurement or a widely recognized term in contemporary systems of measurement. It's possible that "long reed" is used in a specific context or industry, but it does not have a standard definition in general measurements.
If you have more context or specific information about how "long reed" is used, I would be happy to try to provide a more precise explanation.