Your smartphone already does an amazing variety of things. It's your camera, navigation guide, and compass. You may not know that it can also function as a real barometer and altimeter, allowing you ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

The make of this object is Negretti Zambra, and it's dated around 1867. This company were active between 1850s and c 1935, and produced optical and scientific instruments, specialising in telescopes.