![Lindbergh hour angle patent prototype drawings](https://flightbirds.net/wp-content/uploads/2023/07/Lindbergh-patent-application.jpg)
The World’s first production Hour–angle timepiece
Longines experienced a multiple decade zenith in the first half of the twentieth century and ...
![Sky to Space, Lindbergh, Goddard, NASA rocket technology](https://flightbirds.net/wp-content/uploads/2023/07/Goddard-space-flight-centre.jpg)
From Sky to Space – The Moon Man & his Mate
“Every vision is a joke until the first man accomplishes it; once realized, it becomes ...
![Lindbergh wittnauer longines special flight calculator, hour-angle, weems, calotte, cal24.41 8 day power reserve](https://flightbirds.net/wp-content/uploads/2023/06/Lindbergh-Heinmuller-memo-re-special-calculator-watch.webp)
Lindbergh’s Elusive Special Flight Calculator…
Albert Wittnauer agreed to stock a minimum of 17,000 Longines watches in America by 1879[1] ...
![](https://flightbirds.net/wp-content/uploads/2022/09/Weems-no-guard-pair.webp)
The Transitional No Crown Guard Weems
Longines first developed the 18.69 pocket watch calibre in 1895, and like their other movements ...
![](https://flightbirds.net/wp-content/uploads/2022/03/Byrd-log-1.webp)
Admiral Byrd’s Antarctic Expedition Weems
Byrd’s Longines Weems speaks of a time when explorers, aviators and aviatrix relied upon them ...
![](https://flightbirds.net/wp-content/uploads/2022/03/sidereal-logo.webp)
Sidereal or Star time….twinkle, twinkle…
Lindbergh stated, “I consider celestial navigation necessary to future aviation”.[1] The “Lindbergh Boom”[2] that followed ...
![](https://flightbirds.net/wp-content/uploads/2022/03/Weems-red-star-3.webp)
The Ultimate Stars – Sidereal timepieces
Weems stated, “It is perhaps fortunate that timepieces were developed before radio, or else extremely ...
![](https://flightbirds.net/wp-content/uploads/2022/03/Bezels-1_2_3.webp)
Longines Bezels Turn First & Second
It has now well accepted that the generation of fifties turning dive bezels heralded from ...
![](https://flightbirds.net/wp-content/uploads/2022/03/Weems-2008734-1.webp)
US Patent 2008734 covers all, or does it?
The “Spirit and Scope of my invention” are the words Philip Van Horn Weems used ...