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Then there's the observatory of Chicago; and I think he has a letter to make him beknown to a gentleman in the observatory at Marseilles and he wants to go to Vienna and Poulkowa, too, he means to take in his way there being great instruments and a lot of astronomers at each place. 'Does he take Europe or America first? she asked faintly, for the account seemed hopeless. Mrs.
Amongst the refracting instruments at work at that period were the glass of the Poulkowa Observatory in Russia, the object-glass of which measured 15 inches in width, that of the French optician Lerebours, furnished with an object-glass equally large, and lastly that of the Cambridge Observatory, furnished with an object-glass 19 inches in diameter.
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