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  2. Reticle - Wikipedia

    en.wikipedia.org/wiki/Reticle

    Reticle accessory (PD-8) used in sniper rifles. A reticle, or reticule [1] [2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual ...

  3. Stadia mark - Wikipedia

    en.wikipedia.org/wiki/Stadia_mark

    Stadia marks on a crosshair while viewing a metric levelling rod. The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m. A typical surveyor's instrument reticle has two pairs of stadia marks. One pair are on the horizontal centreline and the other on ...

  4. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    Level (optical instrument) Modern automatic level in use on a construction site. A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks.

  5. Use spell check in AOL Mail - AOL Help

    help.aol.com/articles/check-spelling-in-new-aol-mail

    Use spell check in AOL Mail. Don't worry about relying on your browser's spell check feature. With AOL Mail, click one button to check the entire contents of your email to ensure that everything is spelled correctly. In addition, you'll never need worry about typos or misspelled words again by enabling auto spell check.

  6. Mac 101: Use built-in OS X tools to spell and grammar check ...

    www.engadget.com/2014-06-27-mac-101-use-built-in...

    Use a different language to check the document: Choose Edit > Spelling and Grammar > Show Spelling and Grammar. Then choose a language, or choose Open Text Preferences to see more options. Correct ...

  7. Edit your personal dictionary in AOL Desktop Gold - AOL Help

    help.aol.com/articles/edit-your-personal...

    Click the Settings button at the top. 3. Click Mail on the left side. 4. Click the Spell Check tab. 5. Click Add after typing in a word and it will be added to your personal dictionary. Desktop Gold automatically spell checks your spelling as you write an email. Learn how to improve the effectiveness of the spell check feature.

  8. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Levelling or leveling ( American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...

  9. 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!

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