The submarine became a potentially viable weapon with the development of the Whitehead torpedo, designed in 1866 by British engineer Robert Whitehead, the first practical self-propelled or 'locomotive' torpedo.[20] The spar torpedo that had been developed earlier by the Confederate States Navy was considered to be impracticable, as it was believed to have sunk both its intended target, and probably H. L. Hunley, the submarine that deployed it. In 1878, John Philip Holland demonstrated the Holland I prototype.
Discussions between the English clergyman and inventor George Garrett and the Swedish industrialist Thorsten Nordenfelt led to the first practical steam-powered submarines, armed with torpedoes and ready for military use. The first was Nordenfelt I, a 56-tonne, 19.5-metre (64 ft) vessel similar to Garrett's ill-fated Resurgam (1879), with a range of 240 kilometres (130 nmi; 150 mi), armed with a single torpedo, in 1885.
A reliable means of propulsion for the submerged vessel was only made possible in the 1880s with the advent of the necessary electric battery technology. The first electrically powered boats were built by Isaac Peral y Caballero in Spain (who built Peral), Dupuy de Lôme (who built Gymnote) and Gustave Zédé (who built Sirène) in France, and James Franklin Waddington (who built Porpoise) in England.[21] Peral's design featured torpedoes and other systems that later became standard in submarines.[22][23]
Answer: A Contribution is Something that Creates a Common Understanding and Helps Contribute to Society in Some Form.
Explanation:
History is like a puzzle, it helps create long term effects and short term effects that can help solve the puzzle. An artifact, a revolutionary scientific experiment, or a discovery, etc, can be a contribution to the past and the present. <em>It can both have long term and short term effects. It helps society understand more about the past and how that something may have helped the past.</em> Let's say that there was an ancient civilization, there wasn't much evidence that this civilization lived. Let's say hypothetically, a research team found an important discovery like a child's toy that shaped history and created a domino-like effect as to why that civilization impacted our culture/community today. The toy helped create entertainment for civilization. The toy from that civilization helps us understand and think about when/where the civilization could have lived, were they an advanced civilization, did they have their own society or tribe, were they advanced enough to understand the concepts of entertainment and fun? That's the kind of thing that makes something a contribution. Discoveries can also provide evidence of something like cold cases. Let's say we found out who/what exposed Anne Frank's family, that would impact the past and the present. That would be a major contribution because it would be the solution to a decades-long mystery and it would help bring justice to the family. Another example, what if scientists found in an alternate planet where an advanced society lived? Like Homo-Sapiens lived, that would impact both past and present due to the formation of the planet and if it provides answers to how our planet formed. It would also be an important discovery for future research. <em>Much of history is a contribution to the past and the present. *This might be my understanding*</em>
Answer:
There are numerous reasons regarding why the domain was as effective as it seemed to be, yet some of them incorporate its extremely solid and sorted out military and its unified political structure. These early, effective governments make the Ottoman Empire one of the most significant ever.
Explanation:
Answer:Despite poor economic conditions, Hoover faced little opposition at the 1932 Republican National Convention. ... Roosevelt united the party around him, campaigning on the failures of the Hoover administration. He promised recovery with a "New Deal" for the American people.
Explanation:
