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  2. Electric fireplace - Wikipedia

    en.wikipedia.org/wiki/Electric_fireplace

    The electric fire was invented in 1912 [2] and became popular in the 1950s. [3] Electric fireplaces found in 1950s homes were typically small and could be easily moved. [4] Techniques for electrical "flame effects" have been around since at least 1981. [5] Commercial electric fireplace techniques include the Optiflame, introduced in 1988 by ...

  3. Majestic Radios - Wikipedia

    en.wikipedia.org/wiki/Majestic_Radios

    The Majestic Model #71 introduced in 1927, for example, was a tuned radio frequency receiver with a 9-inch (23 cm) speaker, powered from AC house current. [10] This was a considerable improvement over previous radios having typically poor selectivity and producing inferior sound from old-fashioned horn speakers or earphones.

  4. Franklin stove - Wikipedia

    en.wikipedia.org/wiki/Franklin_stove

    A Franklin stove. The Franklin stove is a metal-lined fireplace named after Benjamin Franklin, who invented it in 1742. [1] It had a hollow baffle near the rear (to transfer more heat from the fire to a room's air) and relied on an "inverted siphon" to draw the fire's hot fumes around the baffle. [2]

  5. Fireplace mantel - Wikipedia

    en.wikipedia.org/wiki/Fireplace_mantel

    Fireplace and overmantel at Boston Manor House. Up to the twelfth century, fires were simply made in the middle of a home by a hypocaust, or with braziers, or by fires on the hearth with smoke vented out through the lantern in the roof. [1] As time went on, the placement of fireplaces moved to the wall, incorporating chimneys to vent the smoke ...

  6. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    For signal pentodes, an odd model number most often identified a variable-mu (remote-cutoff) tube, whereas an even number identified a 'high slope' (sharp-cutoff) tube For power pentodes and triode-pentode combinations, even numbers usually indicate linear (audio power amplifier) devices while odd numbers were more suited to video signals or ...

  7. File:Majestic 12 Part 1 of 1.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Majestic_12_Part_1_of...

    English: Majestic 12 In 1988, two FBI offices received similar versions of a memo titled “Operation Majestic-12…” claiming to be highly classified government document. The memo appeared to be a briefing for newly-elected President Eisenhower on a secret committee created to exploit a recovery of an extra-terrestrial aircraft and cover-up ...