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  2. File:Gold leaf electroscope diagram.svg - Wikipedia

    en.wikipedia.org/wiki/File:Gold_leaf...

    The original can be viewed here: Gold leaf electroscope diagram.jpg: . Modifications made by Krzysztof ZajÄ…czkowski (malyszkz) . I, the copyright holder of this work, hereby publish it under the following license:

  3. Vacuum pump - Wikipedia

    en.wikipedia.org/wiki/Vacuum_pump

    The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]

  4. Leaf blower - Wikipedia

    en.wikipedia.org/wiki/Leaf_blower

    A leaf blower, commonly known as a blower, is a device that propels air out of a nozzle to move debris such as leaves and grass cuttings. Leaf blowers are powered by electric or gasoline motors . Gasoline models have traditionally been two-stroke engines , but four-stroke engines were recently introduced to partially address air pollution concerns.

  5. Vacuum fluorescent display - Wikipedia

    en.wikipedia.org/wiki/Vacuum_fluorescent_display

    A vacuum fluorescent display (VFD) is a display device once commonly used on consumer electronics equipment such as video cassette recorders, car radios, and microwave ovens. A VFD operates on the principle of cathodoluminescence , roughly similar to a cathode-ray tube , but operating at much lower voltages.

  6. Vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Vacuum_cleaner

    A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets, hard floors, and other surfaces. The dirt is collected into a dust bag or a plastic bin.

  7. Tree structure - Wikipedia

    en.wikipedia.org/wiki/Tree_structure

    A tree structure, tree diagram, or tree model is a way of representing the hierarchical nature of a structure in a graphical form. It is named a "tree structure" because the classic representation resembles a tree , although the chart is generally upside down compared to a biological tree, with the "stem" at the top and the "leaves" at the bottom.

  8. Sims' vaginal speculum - Wikipedia

    en.wikipedia.org/wiki/Sims'_vaginal_speculum

    Sims' double bladed vaginal speculum. In gynaecology, Sims' vaginal speculum is a double-bladed surgical instrument used for examining the vagina and cervix.It was developed by J. Marion Sims out of pewter spoon, [1] but nowadays it is manufactured out of stainless steel or plastic.

  9. Plant stem - Wikipedia

    en.wikipedia.org/wiki/Plant_stem

    The stem anatomy of ferns is more complicated than that of dicots because fern stems often have one or more leaf gaps in cross section. A leaf gap is where the vascular tissue branches off to a frond. In cross section, the vascular tissue does not form a complete cylinder where a leaf gap occurs.

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