The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 412
. The Engraving, fig. 1, is a front view of this very ingenious and useful instrument; fig. 2 exemplifies the manner of its application. Besides the valuable testimonial referred to, from Professor Airey, we observe there is one from IVlr. Reynolds, of the Kew Observatory, who says— Tour instrument…
Architecture · Civil engineering · Science
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