0

Pre-Chronometer, Ships at Sea Used ‘Sundial Cannons’ to Mark Noon O’Clock

I was talking with someone – sadly we were not on a boat at the time – about seafaring inventions, and was previously unaware of sundial cannons; I knew of noonday guns (on land) and had seen lenses used to set wicks aflame, but had never considered this setup as a timekeeper, especially not while at sea!

In naval operations, the gun had to be mounted on a rotating base because its orientation had to be in the north-south direction. The directional axis of the gun was determined using the ship’s compass. In such operation, the gun was frequently referred to as the “noonday gun” because it fired at noon.[3] This practice became obsolete when the ship chronometer was invented. The use of the sundial cannon was subsequently confined to substandard ships.

Read more.


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

Join 7,500+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython in 2018 – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Fewer startups, and other collateral damage from the 2018 tariffs

Wearables — Light as a Worbla feather

Electronics — How to make your own magnetic field probe!

Biohacking — The State of DNA Analysis in Three Mindmaps

Python for Microcontrollers — One year of CircuitPython weeklies!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.