Search found 10938 matches

by Mark
Tue Jan 30, 2024 7:21 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Well another thought, as brass is heated it expands quite a bit as Tyndall way back in 1800's used a rod of it to when heated, made an electrical connection. Anyway as the wheel rotates perhaps giving up some heat it contracts in the contact spot helping the wheel roll. Or a typical explanation the ...
by Mark
Sat Jan 27, 2024 1:17 am
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537578

Re: youtube

I built a long-range LASER turret in my yard!
https://www.youtube.com/watch?v=xNmbvaUzC8Q
by Mark
Fri Jan 26, 2024 4:51 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Something to razzle the viewer. I have to wonder how many might think it fake?
Little Wheel Motor or Trevelyan Rocker Roulette
https://www.youtube.com/watch?v=9jKUXVG8duE
by Mark
Sun Jan 21, 2024 8:22 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Slow Acceleration of the Trevelyan Rocker Effect
https://www.youtube.com/watch?v=C31kqFgWjjk
by Mark
Sun Jan 21, 2024 7:57 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Tyndall's Heat Considered as a Mode of Motion
https://www.youtube.com/watch?v=2u6yTjKzGpM
by Mark
Sat Jan 20, 2024 12:26 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

A spare Dyna-jet valve retainer repurposed ...
Brass Bird Rocker
https://www.youtube.com/watch?v=CUXSz9J8hjs
by Mark
Tue Jan 16, 2024 6:03 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

it might be interesting to spruce this effect up. Dental Mirror and Watchband Repair Hammer Rocker https://www.youtube.com/watch?v=Ij6MkXeXVjE Creating something like this visual movement. https://twitter.com/RealPreCinema/status/1414373172049321986 Wheatstone-type kaleidophone http://waywiser.fas.h...
by Mark
Tue Jan 16, 2024 2:13 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Abstract "In November 1830, the Edinburgh chemist David Boswell Reid received a visit from a local workman named Arthur Trevelyan. Cold bars of lead, bell-metal, tin-solder and pale solder, when placed on heated iron or brass, produced vibration and tone. The cold lead block, placed on the heated po...
by Mark
Wed Jan 10, 2024 2:23 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

"Rock-salt.—The rocker used in the foregoing experiment was laid aside and a piece of rock-salt was prepared for trial. The mass was cloven so as to exhibit the surfaces of the primitive cube; and was so placed that the straight line formed by the intersection of two of the surfaces of the cube was ...
by Mark
Tue Jan 09, 2024 8:14 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Well it worked somewhat but takes a lot of heat. It ran for about 15 minutes with intermittent heating. With heating it slowly speeds up but the large mass and surface area doesn't help.
Trevelyan Rocking Horse
https://www.youtube.com/watch?v=m7VjfTOmJ4I
by Mark
Mon Jan 08, 2024 3:16 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

"Whenever the hot rocker comes into contact with its lead carrier, a nipple suddenly juts from the latter, being produced by the heat communicated to the lead at the point of contact." "The rocker is tilted up, and some other point of it comes into contact with the lead, a fresh nipple is produced, ...
by Mark
Sun Jan 07, 2024 4:43 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

I was able to get a 175 gram object or over 6 ounce lead sinker equivalent (for the fisherman out there), to run Trevelyan Rocker style for over 30 minutes after a single initial heating. Then just when it stopped, it was cool enough to hold in my hand. Spiffy.
by Mark
Sat Jan 06, 2024 1:14 am
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537578

Re: youtube

(Somewhat Clockish)
Using Physics to Make A Balancing Toy!
https://www.youtube.com/watch?v=c84WZok5d_o
by Mark
Fri Jan 05, 2024 11:50 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

The typical Trevelyan Rocker has perpendicular contact between the two parts, I think so not too much of the heat from the above rocker doesn't destroy or dampen the heat gradient. One physics lab says they keep the lead base in the freezer which is said to make it work better. If too much heat is p...
by Mark
Fri Jan 05, 2024 3:47 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 813034

Re: Odds and ends

Tidbits Melde's Experiment with the Trevelyan Rocker "The usual explanation of the phenomenon is that the lead is heated as the iron strikes it, and throwing up little elevations, first at one and then at the other corner of the bolt, under thermic expansion, keeps the bolt in oscillation." https://...