Word: polarizing
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Dates: during 1880-1889
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...this means an instant comparison can be secured between the pole star, as a standard, and the object of investigation, which is to be classified. The polar telescope has an aperture of five inches and a focal length of about seven feet...
...beginning this series of photometric observations, about ten years ago, Prof. Pickering first made use of a horizontal telescope and mirror attachment. The instrument was called a "photometer." There was a companion telescope, also horizontal, combined with it for observing the reflected image of the polar star. The same instrumental adaptations were made for the subsequent or second series. This long experience gave confidence in incurring the expense of the larger under-taking now brought to perfection...
Will said that the bald-head was like the north star, inasmuch as it was a polar luminary. It was also like a glass tube in a vessel of mercury, as it had no capillary attraction. Remembering my experience previous to the semi-annuals, I ventured the comparison, that a bald-head was like a high mark in N. H. 3; it made a fellow groan to get it, but once his, he would not part with it for the world...
...Lighthead once more climbed the granite steps, and venturing in, he encountered two strange and marvellous beasts. One was as a polar bear, white; the other bore the tawny mane of a lion, but naught else pertaining to that creature. Then Lighthead trembled in his sandals, for these guardians of the place seemed very wroth. But the first despatched him to the second, and the second to the first; and whilst they were dallying thus, Lighthead vanished through the door, leaving them still discussing which of them should feed upon him; for he was a fresh morsel...