Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
John Bell Blish
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB190202886ApublicationCriticalpatent/GB190202886A/en
2886. Blish, J. B. Feb. 4. Sextants; telescopes.-Relates to the combination with these instruments of a 90‹ prism, to enable observation to be taken of objects 180‹ apart. The prism H, Fig. 1, is attached by a screw G<1> in front of the index glass F, so that the ray 3, 4, from the rear is reflected at 5, 6, and 7 into the eye of the observer. The prism may be fitted in front of one of the objectives of a binocular telescope.
GB190202886D1902-02-041902-02-04Improvements in Instruments for Navigating and Surveying.
ExpiredGB190202886A
(en)