Tag Archives: john herschel

John Herschel and his Lens Designs

by John Church Charles Hastings once wrote that the lens which is now on our Hastings-Byrne refractor was similar in design to the types described by John Herschel (1792-1871). He also mentioned that such lenses do not greatly differ from … Continue reading

Posted in April 2021, Sidereal Times | Tagged , , | Leave a comment