Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Sextant with an umbrella
    From: Gary LaPook
    Date: 2015 Oct 2, 04:08 +0000

    about a year ago weren't we discussing a Soviet dip measuring instument?


    From: Rommel John Miller <NoReply_Miller@fer3.com>
    To: garylapook@pacbell.net
    Sent: Thursday, October 1, 2015 8:32 PM
    Subject: [NavList] Re: Sextant with an umbrella

    Note the search phrase for Google patents above, Blish and sextant
    is the link.  But search blish sextant and see his three navigation patents. 
    I was really hoping that the wonderful sextant umbrella as Frank Reed posited would be there, but it wasn’t.
    All close but no real cigar. 
    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: 
    this link is for a Scanning Sextant not unlike the aviation sextants I have seen:
    And this link gets you a neat sounding tube for navigation:  The Zera I
    After reading the Wikipedia article on John Blish and learning he was Spanish American War it makes sense to me.  The picture Wikipedia provides is an uncanny ringer for the one in Frank’s picture of Sextant Umbrella. 
    So I would guess the umbrella is something that was never awarded a patent, but was useful all the same. 
    Hope this answers Frank’s question. 
    Rommel John Miller
    8679 Island Pointe Drive
    Hebron, MD  21830-1093
    410-219-2690 (Land and Home)
    443-365-7925 (Cell)

    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
    New Zealand

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site