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  2. Twelve-Mile Circle - Wikipedia

    en.wikipedia.org/wiki/Twelve-Mile_Circle

    The Twelve-Mile Circle Diagram of the Twelve-Mile Circle, the Mason-Dixon Line, and The Wedge. The diagram shows the survey lines involved in the disputes, not current borders. The Twelve-Mile Circle is an approximately circular arc that forms most of the boundary between Delaware and Pennsylvania. It is a combination of different circular arcs ...

  3. Mason–Dixon line - Wikipedia

    en.wikipedia.org/wiki/Mason–Dixon_line

    Dan Seals sang "Mason Dixon line" and the song symbolically references the line. [51] GZA references the "Mason-Dixon Line" in the closing words of his feature verse on Raekwon's song "Guillotine (Swords)" from his debut 1995 album Only Built 4 Cuban Linx. [52] Tom Lehrer references the Mason–Dixon line in his song "I Wanna Go Back to Dixie ...

  4. Delaware Wedge - Wikipedia

    en.wikipedia.org/wiki/Delaware_wedge

    Mostly because of the difficulty of surveying the Twelve-Mile Circle tangent point and the Tangent Line, astronomer Charles Mason and surveyor Jeremiah Dixon were hired. This complex border became known as the Mason–Dixon line. There turned out to be a small wedge of land between 39° 43′ N latitude, the Twelve-Mile Circle, and the North Line.

  5. Ruled paper - Wikipedia

    en.wikipedia.org/wiki/Ruled_paper

    It has 1 ⁄ 2 in (12.7 mm) spacing between ruling lines, with a single margin drawn down the center of the page. Wide ruled (or legal ruled) paper has 11 ⁄ 32 in (8.7 mm) spacing between horizontal lines, with a vertical margin drawn about 1 + 1 ⁄ 4 inches (32 mm) from the left-hand edge of the page. It is commonly used by American ...

  6. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A USAF 1951 resolution chart in PDF format is provided by Yoshihiko Takinami. This chart should be printed such that the side of the square of the 1st element of the group -2 should be 10 mm long. USAF 1951 Resolution Target Further explanations and examples; Koren 2003: Norman Koren's updated resolution chart better suited for computer analysis

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    A combination square features a ruler (the blade) which can be slid and adjusted within a head (the stock). The head usually has one face at 90° to the ruler, and another face at 45° to the ruler. Originally designed for machinists, the tool is also commonly used in woodworking.

  9. Technical pen - Wikipedia

    en.wikipedia.org/wiki/Technical_pen

    Text (produced by an ISO stencil template for use with the technical pens) of 5 mm in height has a stroke or line thickness of 0.5 mm, and so requires a brown-nibbed 0.5 mm pen. If this text were used in an ISO-sized document (e.g. A0), and the document were reproduced at half its original height (A2), the text would be rendered 2.5 mm high ...

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