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  2. Polaroid 20×24 camera - Wikipedia

    en.wikipedia.org/wiki/Polaroid_20×24_camera

    A plexiglass sheet is taped to the front of the lens, and the subject uses their reflection to help determine where they are in the frame. Because of the size of the image, acquiring an image with sufficient depth of field can be a challenge, and the lens (the camera at 20×24 Studio in New York City was fitted with a Fujinon-A 600 mm f / 11 ...

  3. Picture frame - Wikipedia

    en.wikipedia.org/wiki/Picture_frame

    View of a frame-maker's workshop, oil on canvas, circa 1900 The elaborate decoration on this frame may be made by adhering molded plaster pieces to the wood base.. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters ...

  4. Picture framing glass - Wikipedia

    en.wikipedia.org/wiki/Picture_framing_glass

    Due to widespread availability and low cost, Soda Lime Glass is most commonly used for picture framing glass. Glass thicknesses typically range from 1.8 to 2.5 millimetres (0.071 to 0.098 in). Clear glass has light transmission of approximately 90%, absorption of approximately 2%, and reflection of approximately 8%. Whereas absorption can be ...

  5. Timber framing - Wikipedia

    en.wikipedia.org/wiki/Timber_framing

    A simple timber frame made of straight vertical and horizontal pieces with a common rafter roof without purlins. The term box frame is not well defined and has been used for any kind of framing (with the usual exception of cruck framing). The distinction presented here is that the roof load is carried by the exterior walls.

  6. Maddie's Do You Know? - Wikipedia

    en.wikipedia.org/wiki/Maddie's_Do_You_Know?

    Maddie visits an optician to see how an eye test works by having one herself. She reads the charts and shapes on the wall and looks into a special camera that takes a picture of the back of our eyes to make sure they are healthy. Then, Maddie shows us how glasses frames are made by shaping gold wire at a factory.

  7. Polyvinyl chloride - Wikipedia

    en.wikipedia.org/wiki/Polyvinyl_chloride

    Polyvinyl chloride is formed in flat sheets in a variety of thicknesses and colors. As flat sheets, PVC is often expanded to create voids in the interior of the material, providing additional thickness without additional weight and minimal extra cost (see closed-cell PVC foamboard). Sheets are cut using saws and rotary cutting equipment.