Wilkins writes that the main difficulty and labour of it will be in the raising of it from the ground; near unto which, the earths attractive vigor is of greatest efficacy. But for the better effecting of this, it may be helped by the strength of winds,... The Mathematical and Philosophical Works of the Right Rev. John Wilkins ... - الصفحة 207 بواسطة John Wilkins - 1802 عرض كامل -
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