Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
3,885 replies · 242K views
Physics news on Phys.org
Staff Emeritus
Science Advisor
Homework Helper
2025 Award
- 16,110
- 8,423
Today I was at the North Carolina State Fairgrounds for a coin/stamp/postcard show. Nearby was one station of the "State Fair Flyer" chairlift ride. I noticed the station's name is "Wilbur".
Hmmm. I thought, I bet the other station's name is "Orville". I hiked to the other end, and sure enough...
Hmmm. I thought, I bet the other station's name is "Orville". I hiked to the other end, and sure enough...
- 13,829
- 16,654
One channel pushes the needle left/right and the other up/down, IIRC. I think the arrows may be trying to point out vinyl structures that are "mostly a ridge" and "mostly a joggle".berkeman said:Well clearly I'll need to do more reading about this encoding...
Edit: or possibly the orthogonal directions are the two diagonals - that might make more sense.
Edit 2: apparently it is the diagonals: https://www.stereophile.com/content/how-does-stereo-vinyl-record-work.
Staff Emeritus
Science Advisor
Homework Helper
2025 Award
- 16,110
- 8,423
And in the 1970s there were quadraphonic (4-channel) LPs, with the four channels encoded into the two physical LP channels in such a way that they could be decoded on playback. There were several incompatible schemes for this, and so the whole concept was never very successful commercially.
https://en.wikipedia.org/wiki/Quadraphonic_sound
IIRC some audio receivers or preamplifiers had multiple quad decoding circuits, with a selector knob that you set according to the type of quad LP you were playing. This was high-end stuff that I couldn't afford in my poor student days.
https://en.wikipedia.org/wiki/Quadraphonic_sound
IIRC some audio receivers or preamplifiers had multiple quad decoding circuits, with a selector knob that you set according to the type of quad LP you were playing. This was high-end stuff that I couldn't afford in my poor student days.
Science Advisor
- 3,380
- 2,934
One of my previous workplace tried to dabble into touchless digitalization of wax recordings. (Some 20+ years ago, when it was still relevant/revolutionary). Not something simple...berkeman said:Well clearly I'll need to do more reading about this encoding...
- 13,829
- 16,654
The neat thing about the stereo system in @berkeman's photo is that both diagonal channels have a component in the horizontal direction that a mono player expects. So if you only have a mono player you get an average of the two channels, but a stereo player plays the two independently. So I think it still works for the less affluent customer. I'm guessing the quadraphonic system did not...jtbell said:There were several incompatible schemes for this, and so the whole concept was never very successful commercially.
DennisN
Gold Member
- 2,194
- 10,288
A caiman/crocodile cub:
Author: Tambako The Jaguar, License: CC BY-ND
Source: https://wallpaperscraft.com/download/caiman_crocodile_cub_1030676/5357x3013
Author: Tambako The Jaguar, License: CC BY-ND
Source: https://wallpaperscraft.com/download/caiman_crocodile_cub_1030676/5357x3013
Staff Emeritus
Science Advisor
Homework Helper
2025 Award
- 16,110
- 8,423
On my way home from Raleigh today, I stopped in High Point NC. This is billed as the "World's Largest Chest of Drawers".
Just outside town, the Furnitureland South complex has what looks like an even larger chest of drawers, but it's only a façade.
Nearby Thomasville has "The Chair".
If one could climb on it, it would be a great place for railfans to sit and watch trains.
Just outside town, the Furnitureland South complex has what looks like an even larger chest of drawers, but it's only a façade.
Nearby Thomasville has "The Chair".
If one could climb on it, it would be a great place for railfans to sit and watch trains.
Science Advisor
Gold Member
- 4,941
- 1,574
Staff Emeritus
Science Advisor
Homework Helper
2025 Award
- 16,110
- 8,423
has some history behind it:jtbell said:the "World's Largest Chest of Drawers"
https://www.roadsideamerica.com/story/2148
DennisN
Gold Member
- 2,194
- 10,288
A pretty nice castle! 
Photo by Cederic Vandenberghe, location: Eltz Castle, Wierschem, Germany
Source: https://unsplash.com/photos/closeup-photo-of-castle-with-mist-21DP3hytVHw

Photo by Cederic Vandenberghe, location: Eltz Castle, Wierschem, Germany
Source: https://unsplash.com/photos/closeup-photo-of-castle-with-mist-21DP3hytVHw
docnet
- 796
- 487
That's the Hogwarts School from Harry Potter! Too bad I didn't get accepted. I read the lunch banquets are incredible there.DennisN said:A pretty nice castle!
View attachment 341801
Photo by Cederic Vandenberghe, location: Eltz Castle, Wierschem, Germany
Source: https://unsplash.com/photos/closeup-photo-of-castle-with-mist-21DP3hytVHw
- 7,815
- 4,140
Point Conception
Gold Member
- 1,168
- 1,934
Always a photo after a cappuccino.
docnet
- 796
- 487
So... What is it?morrobay said:Always a photo after a cappuccino. View attachment 341966
Point Conception
Gold Member
- 1,168
- 1,934
Part of grab food ad poster on bus. Looks like the same girl.
DennisN
Gold Member
- 2,194
- 10,288
Two different photos taken recently...
Leaves in spring sunlight:
...and a car in hard rain:
(luckily I had my weatherproof camera with me at that time
)
Leaves in spring sunlight:
...and a car in hard rain:
(luckily I had my weatherproof camera with me at that time
DennisN
Gold Member
- 2,194
- 10,288
No, I didn't use flash (a fast lens (f/1.4 in this case) and high ISO is often sufficient for me). Actually I almost never use flash.berkeman said:Did it startle the driver when your flash went off?
Edit: By the way, I also like to draw as little attention as possible to myself when I'm shooting (and flash is pretty much the opposite
I guess nowadays people are so used to smartphones so when the see a system camera they may think, well, he's doing something unusual. And in fact I've been asked quite a few times what I am doing
And if I'm going around in the city with a big zoom lens, it's even worse, then people REALLY take notice
And it does not fit my personality at all, I usually don't want to be noticed. But no pain, no gain, I guess.
Last edited:
DennisN
Gold Member
- 2,194
- 10,288
Similar threads
Graduate Diffraction from a set of concentric rings with random phase
- Gezstarski
- · Replies 2 ·
- Optics
- Replies
- 2
Correct statement about random process of radioactive decay
- songoku
- · Replies 12 ·
- Introductory Physics Homework Help
- Replies
- 12
Sinusoidal sequences with random phases
- ashah99
- · Replies 1 ·
- Calculus and Beyond Homework Help
- Replies
- 1
Art Please rate my photos on a scale of 1-5
- BadgerBadger92
- · Replies 73 ·
- Art, History, and Linguistics
- Replies
- 73
Very cool factory production line photos
- berkeman
- · Replies 7 ·
- Mechanical Engineering
- Replies
- 7
Undergrad Do you have an example of a truly random phenomenon?
- The_Baron
- · Replies 122 ·
- Other Physics Topics
- Replies
- 122
Undergrad How does spontaneous emission start laser oscillation if photons have random phases?
- kelly0303
- · Replies 19 ·
- Atomic and Condensed Matter
- Replies
- 19
Looking for a reliable inkjet All-In-One printer for photos and docs
- yungman
- · Replies 27 ·
- Computing and Technology
- Replies
- 27
Undergrad Random variable vs Random Process
- fog37
- · Replies 2 ·
- Set Theory, Logic, Probability, Statistics
- Replies
- 2
Stargazing Question about my photos of a Full Moon -- What is this point of light?
- Graham 1956
- · Replies 5 ·
- Astronomy, Astrophysics, Cosmology
- Replies
- 5