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2. Octant (instrument) - Wikipedia

   en.wikipedia.org/wiki/Octant_(instrument)

   One large index mirror was mounted at the point of rotation of the index arm. A second, smaller horizon mirror was mounted on the frame in the line of sight of the telescope. The horizon mirror allows the observer to see the image of the index mirror in one half of the view and to see a distant object in the other half.

3. Bronze mirror - Wikipedia

   en.wikipedia.org/wiki/Bronze_mirror

   Bronze mirrors preceded the glass mirrors of today. ... The Oxford Companion to the Decorative Arts, 1975, OUP ... BAR Supplementary Series 41 (Oxford; 1978), 227–35.

4. Attitude indicator - Wikipedia

   en.wikipedia.org/wiki/Attitude_indicator

   The attitude indicator (AI), also known as the gyro horizon or artificial horizon, is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon, and gives an immediate indication of the smallest orientation change. The miniature aircraft and horizon bar mimic the relationship of the aircraft relative to ...

5. Optical square - Wikipedia

   en.wikipedia.org/wiki/Optical_square

   Used with an autocollimator or angle dekkor and mirror it can be used for machine tool axis squareness checking and for measuring the squareness of surfaces. It has two mirrors at 45 degree to each other. One is half-silvered, called horizon glass, and other is fully silvered, called index glass. It measures angle by double reflection.

6. 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!

7. North Wall Arts Centre - Wikipedia

   en.wikipedia.org/wiki/North_Wall_Arts_Centre

   The North Wall Arts Centre (often just referred to as the North Wall) is a performing arts centre in Oxford, owned by St Edward's School and shared with the city. It houses a 200-seat theatre, plus a rehearsal space, dance studio and a visual art gallery. [1]