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A section can be halved seven times in this way, down to a 5-acre (2 ha) parcel, or half of a quarter-quarter-quarter section—an easily surveyed 50-square-chain (2 ha) area. This system was of great practical value on the American frontier, where surveyors often had a shaky grasp of mathematics and were required to work quickly.
Example of a section index page. The information is organized by section, with a section relating to one square mile. Each section is presented in a two-page representation, usually by presenting the northwest quarter-section as the top half of the left page. The other quarter-sections are placed in map relationship to the northwest. [1]
These nails were known as cut nails because they were produced by cutting iron bars into rods; they were also known as square nails because of their roughly rectangular cross section. The cut-nail process was patented in the U.S. by Jacob Perkins in 1795 and in England by Joseph Dyer, who set up machinery in Birmingham. The process was designed ...
Different railroads used different sized nails with either alpha or numerical markings. An example would be a Southern Pacific Railroad nail with the marking "01" stamped on the head of the nail. The "01" would identify the nail as being hammered into a railroad tie in the year 1901. [2] Date nails can vary in size, shape, length, material, and ...
Each 36-square-mile (about 93.2 km 2) township is divided into 36 sections of one square mile (640 acres, roughly 2.6 km 2) each. [1] The sections can be further subdivided for sale. The townships are referenced by a numbering system that locates the township in relation to a principal meridian (north-south) and a base line (east-west). For ...
The section sign (§) is a typographical character for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. [1] It is also known as the section symbol, section mark, double-s, or silcrow. [2] [3] In other languages it may be called the "paragraph symbol" (for example, German ...
The first quarter of the year runs from January through March, the second quarter is from April through June, and so on. But companies operate on business-oriented “fiscal quarters” instead.
From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. [1] A 7.5 minute quadrangle map covers an area of 49 to 70 square miles (130 to 180 km 2 ). [ 2 ]