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focal length
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The object glass is three inches; the
focal length
forty-three inches; and the telescope, when drawn out, with the pancratic eyepiece attached, is about four feet.
optics
distance focale
La distance sur laquelle une lentille ou un système optique fait converger la lumière en un foyer.
Men of Invention and Industry
"Men of Invention and Industry" by Samuel Smiles is a historical account likely written in the late 19th century. The book examines the lives and contributions of various inventors and industrialists, highlighting their impact on society, particularly within British industry, with an emphasis on significant advancements such as shipbuilding and steam power. The opening of the book sets the stage with a discussion of the early history of English shipbuilding, beginning with the figure of Phineas Pett. It explores the humble beginnings of the British navy and the advancements made under historical figures like Henry VIII. Various early challenges in shipbuilding are elucidated, alongside the importance of foreign expertise in developing England’s maritime capabilities. The narrative illustrates a shift from a heavy reliance on importing goods and expertise to a burgeoning English independence in shipbuilding and trade, paving the way for a stronger national identity tied to maritime innovation.
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