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    Re: Sextant with an umbrella
    From: Rommel John Miller
    Date: 2015 Oct 1, 23:09 -0400

    https://www.google.com/patents/US2981143?dq=blish+sextant

     

    Note the search phrase for Google patents above, Blish and sextant

     

    https://www.google.com/patents/US714276?dq=blish+sextant&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMIu7eopeSiyAIVyZWICh082QxL

     

    is the link.  But search blish sextant

     

    I was really hoping that the wonderful sextant umbrella as Frank Reed posited would be there, but it wasn’t.

     

    Still an interesting take on the idea of prisms and a sextant. 

     

    Funny do a patents (google) on Blish and Navigation and see what pops up! 

     

    This link will get you there: 

     

    https://www.google.com/patents/US714276?dq=blish+navigation&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMIxYiau-OiyAIVT02ICh2vaw_c

     

    this link is for a Scanning Sextant not unlike the aviation sextants I have seen:

     

    https://www.google.com/patents/US2487337?dq=blish+navigation&hl=en&sa=X&ved=0CCQQ6AEwAWoVChMIxYiau-OiyAIVT02ICh2vaw_c

     

    And this link gets you a neat sounding tube for navigation:  The Zera I

     

    https://www.google.com/patents/US617451?dq=blish+navigation&hl=en&sa=X&ved=0CCsQ6AEwAmoVChMIxYiau-OiyAIVT02ICh2vaw_c

     

    This site however is just cool:

     

    http://www.theglobaltutors.com/Physics-Homework-Help/Optics-Homework-Help/Sextant

     

    The physics behind the lovely nautical sextant. 

     

     

    Rommel John Miller

    8679 Island Pointe Drive

    Hebron, MD  21830-1093

     

    410-219-2690 (Land and Home)

    443-365-7925 (Cell)

     

    rommeljohnmiller---.com

    rommeljmiller{at}outlook.com

     

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Bill Morris
    Sent: Thursday, October 1, 2015 10:22 PM
    To: rommeljohnmiller---.com
    Subject: [NavList] Re: Sextant with an umbrella

     

    I agree with Luc. It's a Blish prism. More details and a patent drawing can be found here: http://sextantbook.com/2012/04/

    Bill Morris

    Pukenui

    New Zealand

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