Drawing device in stereographic and gnomonic projection. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the object of the main patent number 387,573 by "drawing device in stereographic and gnomonic projection" characterized in that the device extends the path of the adbc diamond on the frame s, to be able to measure with the collimator zenith readings equal to zero. (Machine-translation by Google Translate, not legally binding)