Helge palmcrantz biography samples
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Nordenfelt Submarines ()
Design of Nordenfelt submarines
Nordenfelt I, the first Greek submersible
The Nordenfelt I built for Greece in trials off Stockholm &#;
The Nordenfelt I was a tonne, metre long vessel based on the Resurgam of It had an improved range of km, and was armed with a single torpedo and naturally a mm Nordenfelt machine gun. Bolinders in Stockholm was contacted for the manufacturing, and the submersible was built between and The N°1 was a pure submersible, first and foremost operated from the surface, thanks to a HP steam engine, fed by a coal-fired boilers, procuring the modest speed of 9 knots. It was shut down when diving as the smokestack was collapsible. The idea was there was still sufficient steam remaining inside the boilers to procure some speed underwater. The ballasts were filled or purged by pumps not electrically, but also by using steam, and there were two vertically-acting screws over the deck to man the sub plunging or surface quicker.
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1-inch Nordenfelt gun
This article is about the anti-torpedo boat gun. For the rifle calibre "machine gun", see Nordenfelt gun.
Naval gun
The 1-inch Nordenfelt gun was an early quick-firing light gun intended to defend larger warships against the new small fast-moving torpedo boats in the late s to the s.
Description
[edit]The gun was an enlarged version of the successful rifle-calibre Nordenfelt hand-cranked "machine gun" designed by Helge Palmcrantz and was intended to combine its rapid rate of fire with a projectile capable of deterring attacking torpedo boats. The gun fired a solid steel bullet with hardened tip and brass jacket: under the terms of the St. Petersburg Declaration of , exploding shells weighing less than grams were not allowed to be used in warfare between the signatory nations.
The gun was used in one, two and four-barrel versions. The ammunition was fed by gravity from a hopper above the breech subdivided into separate columns for each barrel. Th
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List of Swedish inventors
Swedish inventors are Swedish people who invented novel ideas, machines or tools.
In the 18th century, Sweden's scientific revolution took off. Previously, technical progress had mainly come from professionals who had immigrated from mainland Europe. In , the Royal Swedish Academy of Sciences was founded, with people such as Carl Linnaeus and Anders Celsius as early members.
Sweden had a total of 49, patents as of according to the United States Patent and Trademark Office, and only ten other countries had more patents than Sweden.[1]
The traditional engineering industry is still a major source of Swedish inventions, but pharmaceuticals, electronics and other high-tech industries are gaining ground. A large portion of the Swedish economy is to this day based on the export of technical inventions, and many large multinational corporations from Sweden have their origins in the ingenuity of Swedish inventors.[2]