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Petromax is a brand name for a type of pressurised paraffin lamp (US: kerosene lamp) that uses a mantle. They are as synonymous with the paraffin lamp in Continental Europe as Tilley lamps are in Britain and Coleman lanterns are in the United States.
The Petromax lamp was created in 1910 in Germany by Max Graetz (1851–1937), who also named the brand, on the basis of a spirit lamp that was already well-known.
Graetz was president of the firm Ehrich & Graetz in Berlin, which developed the lamp, and also the primary designer.
He had wanted to create a lighting system fueled by paraffin, which was then a new product. Graetz invented a process to make a gas out of paraffin; which has a very high caloric value and could make a very hot blue flame.
Graetz then designed a pressure lamp, working with vaporized paraffin. To start this process, the lamp was preheated with methylated spirit (denatured alcohol), in later models with an integrated blow torch called "Rapidstarter" running from the paraffin tank directly. In a closed tank, paraffin was pressurised with a hand pump. The heat produced by the mantle was then used to vaporize the paraffin, which is mixed with air and blown in to mantle to burn. Around the year 1916, the lantern and its name started to spread around the world. The name Petromax derives from "Petroleum" and "Max Graetz".
The design was such a success that it still is being used to this day. The name Petromax has become synonymous with paraffin pressure lamps in many countries. The design of the lamps was later used to create a cooker based on the same principles.
In many countries "Petromax" is a registered Trademark, e.g. for the US by Britelyt Inc. or for Germany and some other European countries by Pelam International Ltd.
The Petromax design has been often copied, today such as by Tower in China, Lea Hin in Indonesia or Prabhat in India.
Kerosene, or paraffin, is a combustible hydrocarbon liquid which is derived from petroleum. It is widely used as a fuel in aviation as well as households. Its name derives from Greek: κηρός (kērós) meaning "wax", and was registered as a trademark by Canadian geologist and inventor Abraham Gesner in 1854 before evolving into a generic trademark. It is sometimes spelled kerosine in scientific and industrial usage.
A kerosene lamp is a type of lighting device that uses kerosene as a fuel. Kerosene lamps have a wick or mantle as light source, protected by a glass chimney or globe; lamps may be used on a table, or hand-held lanterns may be used for portable lighting. Like oil lamps, they are useful for lighting without electricity, such as in regions without rural electrification, in electrified areas during power outages, at campsites, and on boats. There are three types of kerosene lamp: flat-wick, central-draft, and mantle lamp. Kerosene lanterns meant for portable use have a flat wick and are made in dead-flame, hot-blast, and cold-blast variants.
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A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses liquid propellants. Gaseous propellants may also be used but are not common because of their low density and difficulty with common pumping methods. Liquids are desirable because they have a reasonably high density and high specific impulse (Isp). This allows the volume of the propellant tanks to be relatively low. The rocket propellants are usually pumped into the combustion chamber with a lightweight centrifugal turbopump, although some aerospace companies have found ways to use electric pumps with batteries, allowing the propellants to be kept under low pressure. This permits the use of low-mass propellant tanks that do not need to resist the high pressures needed to store significant amounts of gasses, resulting in a low mass ratio for the rocket.
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