sating. causing the plane mirror to be always at the proper inclina- The speculum admits of being beveled with extreme pre and the distance between the two lines will be the requisite tion, whenever the finder is directed to the object. thickness of liner. cision by an optical contrivance which cin… … matters not germane to workshop practice ; and J. T. N., in all. We would then have: Difference of temperature, of the telescope and observatory, the speculum cup contain- disputing or questioning with Mr. Hawkins whether the 30° x 0002036 (coefficient of expansion) X 8 5(hight of car)= ing the…
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