“Naval Architect” William Froude Hand Written 4 Pg Letter Dated 1878. This item is certified authentic by Todd Mueller Auctions and comes with their Certificate of Authenticity. 28 November 1810 in. 4 May 1879 in. South Africa was an English engineer, hydrodynamicist and. Equation and for predicting their stability. Froude was born at. Devon, England, the son of. Archdeacon of Totnes and was educated at. In mathematics in 1832. His first employment was as a surveyor on the. Which, in 1837, led to. Giving him responsibility for the construction of a section of the. Bristol and Exeter Railway. It was here that he developed his empirical method of setting out. And introduced an alternative design to the helicoidal. During this period he lived in. At St Andrew’s Church from 1842 to 1844. He organised, and paid a large amount to the rebuilding of the. And other restoration work. He also offered to pay to restore the. If local people would pay 10% of the cost but this offer was refused. On completion of the Bristol to Exeter line in 1844 he left the town. Institution of Naval Architects. This led to a commission to identify the most efficient hull shape, which he was able to fulfil by reference to scale models: he established a formula now known as the. By which the results of small-scale tests could be used to predict the behaviour of full-sized hulls. He built a sequence of 3, 6 and (shown in the picture) 12 foot scale models and used them in towing trials to establish resistance and scaling laws. His experiments were vindicated in full-scale trials conducted by the. And as a result the first. Was built, at public expense, at his home in. Here he was able to combine mathematical expertise with practical experimentation to such good effect that his methods are still followed today. Froude also tested the “wave-line” theory of. The model Raven had sharp lines in accordance with. The Swan had fuller lines with blunt ends. Raven had less resistance at low speeds of the two, but Swan had less resistance at higher speeds. This showed that the “wave-line” theory was not as universal as claimed, and was the start of a better understanding of hull resistance. In 1877, he was commissioned by the Admiralty to produce a machine capable of absorbing and measuring the power of large naval engines. He invented and built the world’s first. Sometimes known as the hydraulic dynamometer, which led to the formation of. While on holiday as an official guest of the. South Africa, where he was buried with full naval honours. This item is in the category “Collectibles\Autographs\Historical”. The seller is “historicsellsmemorabilia” and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, Korea, South, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Croatia, Republic of, Malaysia, Brazil, Chile, Colombia, Costa Rica, Panama, Trinidad and Tobago, Guatemala, Honduras, Jamaica, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam, Uruguay.