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. cieion by an optical contrivance which… … 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 qaestioning with Mr. Hawkins whether the 30° x 0:002036 (coefficient of expansion) x 8 ‘5(hight of car)= ing the…
Internet Archive · Public domain (published before 1931). Free to use for anything.
