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on 20 March 2017
Great book if you are mathematically minded. quite a difficult read if you are not
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on 16 July 2012
The text in this book looks like it was scanned or photocopied, letters on the same page change size, some are much darker than others and characters have run together in a few places.
A modern printed version would be a more pleasant read.
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on 27 August 2015
At one and the same time, it's easy to understand because the subject matter is really familiar to anyone who's studied even elementary physics and yet it's really, really hard because it's presented by Newton in a way that's completely unfamiliar.

Remember those obscure facts of geometry about angles in a circle and inscribed/exscribed quadrilaterals? That's nothing. This was written in the days before algebra was purely symbolic. Most of the proofs are presented geometrically and where there is some algebra, it's written out in words, not symbols (sesquiplicate - meaning the 3/2 power for example!)

One big trap: At the start of book 3 Newton freely states that he doesn't expect anyone to fully read 1 and 2! Even he thinks the subject is too dry and obscure - it's basically a compendium of every geometrical fact he knows.
Best skip 1 and 2 - go straight to 3.
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on 8 November 2015
For any prospective mechanical engineer or anyone with a profound interest in the fundamental forces of how the universe work this really is a must. While the language is not modern in its phrasing every idea is stated without any assumptions as to the reader's knowledge, it assumes a blank canvas and removes any ambiguity. Newton cleverly uses easily visualised concepts to explain his findings.

Aside from this it is fascinating and humbling to see the inner workings of one of the finest minds of all time. It also shows Newton in a far more humble light than I would have otherwise assumed, where in modern times much has been made of disproving Newton's laws Newton himself states that work involved in coming to these laws was very difficult and that the he hopes the reader will not scold the author for his errors.
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on 13 April 2013
Just downloaded this and of course it's the Principia, so five stars. However, the short biography gives Newton's date of death as his date of birth, so I'm hoping there are no other major typos!
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on 31 January 2015
Interesting book except for the important historical inaccuracy at the beginning. Isaac Newton was born in 1642 not 1727 that's when he died at 84 years of age. Does anybody proof read this before its published electronically?
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on 7 January 2017
This is entirely in Latin with no translation. Those who have left comments are plainly fluent in Latin. Unfortunately, I am not. It also appears that the text has been scanned and then OCR'd so even the Latin looks dodgy. Try a different edition.
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on 16 October 2014
One of the best publications in the history of mankind.
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on 1 February 2015
I'm pleased with this purchase.
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on 20 October 2014
A particularly cynical piece of publishing. This is like a dodgy photocopy of a dodgy photocopy.
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