5 ms·
In a similar vein, John Kraus (Of Antennas... textbook fame) described a gravitational transmitting and receiving system as a fun (?) diversion near the end of
by lb1lf 3y ago
In a similar vein, John Kraus (Of Antennas... textbook fame) described a gravitational transmitting and receiving system as a fun (?) diversion near the end of the book.
It has been a few years, but I seem to recall that the transmitter was a 500T steel bar spun at very close to the maximum RPM the tensile strength of steel allowed; the radiated energy was something like a fraction of an attowatt. (An attowatt = 1*10^-18W)
There are more efficient transmitting schemes out there.
- bee_rider 3y agoIt is kind of wild that we stumbled upon transmitting information via electromagnetic waves so early on. They seem to be hard to beat.
- thx-2718 3y agoFortunately for us we can see them. Gravity waves are much harder to observe.
- BurningFrog 3y agoYou can also argue that we can see them because they are stronger and are evolutionary important.
- mrkstu 3y agoWell, I'd call the inner ear an evolutionary response to gravity...
- db48x 3y agoNot unexpected; electromagnetism is 40 orders of magnitude stronger than gravity!
- jjk166 3y agoIt makes sense that the easiest to implement would also be the easiest to learn. It's more shocking just how much harder every other option is.
- dekhn 3y agoit doesn't seem surprising to me. people were in the lab playing with DC and AC and clearly heard "clicks" from remote instruments that correlated with them turning switches on and off.
- agmm 3y agoI became curious about this and went to the book to learn more. The system proposed in the book is capable of radiating around 2.2 x 10^-29 W by rotating a bar weighing 500 tonnes about 270 times per minute. [1] Source: Kraus, J. D. (1988). Antennas (2nd ed., p. 769). Retrieved from https://ia802907.us.archive.org/8/items/KrausAntennas19882ed/Kraus_Antennas_1988_2ed_text.pdf https://ia802907.us.archive.org/8/items/KrausAntennas19882ed...