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  2. Salamander heater - Wikipedia

    en.wikipedia.org/wiki/Salamander_heater

    Salamander heaters date back to at least 1915. In the early 1940s, W.L. Scheu of Scheu Manufacturing Company, a producer of temporary portable space heating equipment, developed the modern salamander heater to provide warmth to allow construction crews to work in inclement weather. Sales spread across the US, and by the 1950s, to Europe.

  3. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    Distance from heater Propane and natural gas heaters Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft 4 feet 100 sq ft 5 feet 46,000 BTUs 144 sq ft 6 feet 1,500 Watts 196 sq ft 7 feet 256 sq ft 8 feet 324 sq ft 9 feet Requires additional heater 400 sq ft 10 feet Requires additional heater

  4. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    1.5 psi Pressure increase per meter of a water column [26] 10 kPa 1.5 psi Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed] +13 kPa +1.9 psi High air pressure for human lung, measured for trumpet player making staccato high notes [48] < +16 kPa +2.3 psi

  5. 3 Best Grocery Price Comparison Apps To Help You Save - AOL

    www.aol.com/5-best-apps-comparing-grocery...

    Grocery price comparison apps are a great alternative, saving you time and money by showing you where to find the best deals. Check Out: Pocket an Extra $400 a Month With This Simple Hack.

  6. Sandia National Laboratories - Wikipedia

    en.wikipedia.org/wiki/Sandia_National_Laboratories

    One of Sandia's first permanent buildings (Building 800) was completed in 1949. Sandia National Laboratories' roots go back to World War II and the Manhattan Project.Prior to the United States formally entering the war, the U.S. Army leased land near an Albuquerque, New Mexico airport known as Oxnard Field to service transient Army and U.S. Navy aircraft.

  7. Water-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Water-tube_boiler

    The older fire-tube boiler design, in which the water surrounds the heat source and gases from combustion pass through tubes within the water space, is typically a much weaker structure and is rarely used for pressures above 2.4 MPa (350 psi). A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure ...