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2. Focal-plane shutter - Wikipedia

   en.wikipedia.org/wiki/Focal-plane_shutter

   Focal-plane shutters may also produce image distortion of very fast-moving objects or when panned rapidly, as described in the Rolling shutter article. A large relative difference between a slow wipe speed and a narrow curtain slit results in distortion because one side of the frame is exposed at a noticeably later instant than the other and the object's interim movement is imaged.

3. Curtain wall (architecture) - Wikipedia

   en.wikipedia.org/wiki/Curtain_wall_(architecture)

   Curtain walls may be designed as "systems" integrating frame, wall panel, and weatherproofing materials. Steel frames have largely given way to aluminum extrusions. Glass is typically used for infill because it can reduce construction costs, provide an architecturally pleasing look, and allow natural light to penetrate deeper within the ...

4. Curtain - Wikipedia

   en.wikipedia.org/wiki/Curtain

   Panel Pair Curtains are also known as double panel curtains. They refer to two curtain panels hanging on either side of the window. This is the most common style. Tab top curtains are made with narrow straps, that loop or tie at the top edge and hung from the curtain pole. [14]

5. American Surety Building - Wikipedia

   en.wikipedia.org/wiki/American_Surety_Building

   [16] [25] At the time of the building's construction, the thickness of a curtain wall was limited to 32 inches (810 mm), imposing a force of 80,000 pounds per foot (120,000 kg/m) on the foundation. If the walls had been load-bearing, then they would have needed to be 84 inches (2,100 mm) thick, imposing a force of 150,000 pounds per foot ...

6. Type 96 and Type 97 150 mm infantry mortar - Wikipedia

   en.wikipedia.org/wiki/Type_96_and_Type_97_150_mm...

   The Type 96 150mm mortar was never encountered by American or British troops, although it was used in China. The Type 97 150mm mortar was notably used in both Iwo Jima and China. Both types were produced from 1937 to late 1943, with records indicating a total of 201 units delivered to the Imperial Japanese Army. [ 5 ]

7. 660 Fifth Avenue - Wikipedia

   en.wikipedia.org/wiki/660_Fifth_Avenue

   As built, the office space contained prefabricated panels of movable steel walls, developed jointly by Aetna Steel Products and Tishman. [46] Aetna made the panels at its plant in Pottsville, Pennsylvania. The panels were made of about 27,000 panels of 3-inch (76 mm), 20-gauge steel, ranging between 6 and 48 inches (150 and 1,220 mm) long. They ...