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  2. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]

  3. Birth control - Wikipedia

    en.wikipedia.org/wiki/Birth_control

    Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [ 1 ] [ 2 ] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [ 3 ]

  4. Champion (spark plug) - Wikipedia

    en.wikipedia.org/wiki/Champion_(spark_plug)

    Champion went to work producing spark plugs to be used in Buick automobiles. In 1910, the company moved to Toledo, Ohio to be close to the Willys-Overland Auto Company. [1] In 1931, Champion introduced its first suppressor-type spark plugs. It used a carbon-based resistor to reduce the effects of ignition noise on radio waves. [2]

  5. Capacitor discharge ignition - Wikipedia

    en.wikipedia.org/wiki/Capacitor_discharge_ignition

    The discharge capacitor within the CD ignition had the ability to provide a powerful spark in excess of 4 times the spark power of the Kettering system using the same coil, with the exception that spark energy could be maintained at high rpm unlike the Kettering system. The Hyland unit consumed only four amperes at 5000rpm (8cyl) or 10,000rpm ...

  6. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    Even when used perfectly, calendar-based methods, especially the rhythm method, result in a high pregnancy rate among couples intending to avoid pregnancy. Of commonly known methods of birth control, only the cervical cap and contraceptive sponge have comparably high failure rates. This lower level of reliability of calendar-based methods is ...

  7. Spark plug - Wikipedia

    en.wikipedia.org/wiki/Spark_plug

    Spark plug with single side electrode An electric spark on the spark plug. A spark plug (sometimes, in British English, a sparking plug, [1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within ...

  8. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    Fertility awareness methods may be used to avoid pregnancy, to achieve pregnancy, or as a way to monitor gynecological health. Methods of identifying infertile days have been known since antiquity, but scientific knowledge gained during the past century has increased the number, variety, and especially accuracy of methods.

  9. Duraspark - Wikipedia

    en.wikipedia.org/wiki/Duraspark

    Duraspark II distributor, cap and HT (high tension) wires. The Duraspark II is a Ford electronic ignition system.. Ford Motor Company began using electronic ignitions in 1973 with the Duraspark electronic ignition system and introduced the Duraspark II system in 1976.