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EN 13537 (or EN13537) is a European standard designed to standardize the temperature ratings on sleeping bags manufactured and/or sold in Europe. As of 1 January 2005 a CEN criterion came into effect covering the testing and publication of temperature ratings for sleeping bags. The new criterion differs from the standards that existed formerly.
So that practical clothing may be described conveniently by a range of small integers, the unit of thermal resistance, to be called the “tog”, is the resistance that will maintain a temperature difference of 0.1°C. with a flux of 1 watt per square metre, or in more practical terms, 10°C. with a flux of 1 watt per square decimetre.
A sleeping bag's test rating is based on a person who is wearing long underwear, socks and hat, and is sleeping on an insulated pad with an R-value of approximately 5.5. [ citation needed ] There is no standard measurement rating in the U.S., so a 20 °F (−7 °C) bag from one company may not provide the same warmth as a 20 °F (−7 °C) from ...
The degree of rotation of the compensator determines the range to the target by simple triangulation. [1] Coincidence rangefinders made by Barr and Stroud used two eyepieces, and may be confused with stereoscopic units. The second eyepiece showed the operator a range scale so the user could range and read the range scale simultaneously. [2] [3]
Calculations based on fill power and loft are only approximate. The warmth of sleeping bags may be more accurately compared using European Norm temperature ratings that are based on realistic independent laboratory tests. The rated temperature (in degrees Celsius) is the lowest comfortable temperature.
A long-range laser rangefinder is capable of measuring distance up to 20 km; mounted on a tripod with an angular mount. The resulting system also provides azimuth and elevation measurements. A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object.
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