in the ground. In or- the patient. A bent or angled needle is pivoted to angle. The lenses of the eyes of such persons, although der to protect an oil tank, the atmosphere surround- this valve, the end of the needle being adapted to approximately spherical, are slightly cylindrical. ing which is… … Referring to the sad fate of Professor ASTIGMATIC EYEPIECE FOR OPTICAL INSTKUMENTS. Hogan, who lost his life in attempting to navigate the Campbell aerial vessel, illus- To correct this defect, eyeglasses are made in the trated in these columns a few weeks ago, form of a segment of a cylinder upon…
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