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The Principle of Relativity: A Collection of Original Memoirs on the Special and General Theory of Relativity

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The Principle of Relativity: A Collection of Original Memoirs on the Special and General Theory of RelativityThis collection of original papers on the special and general theories of relativity is an unabridged translation of the 4th edition of Das Relativitatsprinzip, together with a revised edition of an additional paper by H. A. Lorentz. CONTENTS: I. Michelson's Interference Experiment by H. A . Lorentz. II. Electromagnetic Phenomena in a System Moving with any Velocity Less than that of Light by H. A . Lorentz. Ill. On the Electrodynamics of Moving

This collection of original papers on the special and general theories of relativity is an unabridged translation of the 4th edition of Das Relativitatsprinzip, together with a revised edition of an additional paper by H. A. Lorentz.
CONTENTS: I. Michelson's Interference Experiment by H. A . Lorentz. II. Electromagnetic Phenomena in a System Moving with any Velocity Less than that of Light by H. A . Lorentz. Ill. On the Electrodynamics of Moving Bodies by A. Einstein. IV. Does the Inertia of a Body Depend Upon its Energy-Content? by A. Einstein. V. Space and Time by H. Minkowski. VI. On the Influence of Gravitation on the Propagation of Light by A. Einstein. VII. The Foundation of the General Theory of Relativity by A. Einstein. VIII. Hamilton's Principle and the General Theory of Relativity by A. Einstein. IX. Cosmological Considerations on the General Theory of Relativity by A. Einstein. X. Do Gravitational Fields Play an Essential Part in the Structure of the Elementary Particles of Matter? by A. Einstein. XI. Gravitation and Electricity by H. Weyl.
The book constitutes an indispensable part of a library on relativity, Nature. It is really a thrill to read again the original papers by these giants, School Science and Mathematics. Warmly recommended, Quarterly of Applied Mathematics.



Binding Type: Paperback
Publisher: Dover Publications
Published: 06/01/1952
ISBN: 9780486600819
Pages: 216
Weight: 0.52lbs
Size: 7.99h x 5.37w x 0.50d
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SKU: 85198117091

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Andrew
Massapequa, US
★★★★★ 4
Solid, but not without fault.
Got it on sale for 90$ and honestly it’s been pretty solid. After making espresso, the grounds are always left watery, but that’s just a design fault in trying to achieve more pressure. The coffee is pretty consistent and solid, a pretty good value for what it is. My main issue is that it leaks water now randomly after about a year of use, which ultimately warped the coffee station it sat on. I know some bigger brands that begin leaking after time as well. So for under 100$, I got what I paid for. this saw some heavy use and got the job done. Probably wouldn’t buy again though.
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Reviewed in the United States on March 12, 2026
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Steven Chenevey
Dallas, US
★★★★★ 5
Worth a lot more than I paid!
I waited a year before making this review. I could not be more impressed with how well this machine has been performing, regardless of its low price. I have been making two or three americacano's a day for a year. Every cup is just like the last. It takes about 90 seconds to have a hot eight ounce americacano! The only time it leaks is if I grind the beans too fine. Once I dial in my grinder, Im set until I switch to different bean. I feel like I have already got my moneys worth. If it died tomorrow, I would order another one.
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Reviewed in the United States on April 27, 2026
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Elizabet Santos
Bozeman, US
★★★★★ 5
The coffee is very tasty
This 20-bar espresso machine is compact, stylish, and very easy to use. It makes great-tasting coffee with a nice crema, and the steam wand works perfectly for cappuccinos and lattes. The water tank is spacious and convenient, and the display showing brew time and water temperature gives it a modern touch. Perfect for enjoying great coffee at home without taking up much space… I’m in love with my coffee maker 😍
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Reviewed in the United States on January 29, 2026
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Jessamy Hutchins
Cuba, US
★★★★★ 1
Wonderful so far! UPDATED REVIEW: little over a month later...
Reducing to 1* due to machine being defective. No longer exerting enough pressure for good shots and the portafilter has started leaking. I've done all troubleshooting and steps that should be taken for these issues to no success. Machine is basically a hot water machine now. 4.5* The warmer on top could certainly be better but other than that I haven't had any issues. Seems to be as advertised. It's definitely quieter than my nespresso machine and makes a better shot for sure. Getting the grind and tamping right takes a bit of trial and error if you're new to making espresso but once you get that down, this machine will do what you need. The Americano option is also a little wonky imo but I haven't messed with it very much. I just run my shots and use the hot water function when I make an americano 🤷🏻‍♀️ as long as it lasts it seems like it's gonna be a great purchase 😌
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Reviewed in the United States on May 1, 2025
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DAILE
San Leandro, US
★★★★★ 5
Excellent espresso at home, easy and quick to use
Excellent espresso coffee maker. Prepare a coffee with a very good aroma, perfect cream and intense flavor, like from a coffee shop. It is easy to use, heats up quickly and its design is modern and compact. Very good value for money. Totally recommended!
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Reviewed in the United States on February 17, 2026

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