Herschels Grand Telescope, (Fig. 24), pub. 1797. Creator: English School (18th Century).
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Herschels Grand Telescope, (Fig. 24), Plate 505 from Encyclopaedia Britannica , pub. 1797 (engraving). Herschel's 40-foot telescope was built between in 1785 and 1789 at Observatory House in Slough. It was a reflecting telescope and was dismantled in 1840; Sir Frederick William Herschel (1738 - 1822).