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The satisfactory nature of its performance is vouched for by the observations made with it upon Jupiter's new satellite in December, 1892. This instrument, to which a Newtonian form has been given, had no rival in respect of light-concentration at the time when it was built. It has now two the Paris 50-inch refractor and the Yerkes 5-foot reflector.
The largest siderostat in the world is the Paris 50-inch refractor, which formed the chief attraction of the Palais d'Optique at the Exhibition of 1900. It has a focal length of nearly 200 feet, and can be used either for photographic or for visual purposes.
Pillowcases to correspond sell at from $1.25 up. Linen for this purpose is always bleached, the 90-inch sheeting being $1 to $3 a yard, the 45-inch pillowcasing 50 cents to $1.50 a yard, and 50-inch casing 75 cents to $2 a yard. Inch-high monograms or letters may be embroidered in white at the middle of sheets and pillowcases, just above the hem.
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