J Ramsden

$Description of the Universal Equatoreal, and of the New Refraction Apparatus, Much Improved by Mr. Ramsden, with the Method of Adjusting the ... Instructions for Making Observations with It$ Description of the Universal Equatoreal, and of the New Refraction Apparatus, Much Improved by Mr. Ramsden, with the Method of Adjusting the ... Instructions for Making Observations with It