arago disk

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superbug
Posts: 392
Joined: 30 Apr 2012, 09:59
State/Location: NSW

arago disk

Post by superbug »

Hi Everyone,

I was looking at buying an Arago Disk but can not find one.
Can someone please let me know where I may buy one from please.
Thanks
Superbug :coffee: :mail:
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Labbie
Posts: 3234
Joined: 28 Nov 2006, 10:00
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Suburb: At Home
State/Location: NSW

Re: arago disk

Post by Labbie »

WOW that's going to be a hard one to source. Ring one of the bigger company's they may be able to source one for you. Or perhaps a neighbouring school has one to could borrow. Do you have a network of Labbies near you???
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:
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superbug
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State/Location: NSW

Re: arago disk

Post by superbug »

Yes I do have a network of labbies nearby. but i think we prefer to have our own.
I am not even sure what it is lol
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Labbie
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Re: arago disk

Post by Labbie »

copper disk with a magnets I believe, as I said one of the larger company's can get you one I am very sure of that, but it may take until next term. We did not have one at Bonnyrigg, unless Nichole you have purchased one since I left???
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:
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Labbie
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Re: arago disk

Post by Labbie »

In this device, a copper disk is rotated rapidly with a hand crank and a step-up pulley system. Balanced on a pivot above the center of the disk is a compass needle. The motion of the needle relative to the highly conducting copper disk induces eddy currents in the disk. In turn, these eddy currents produce a torque on the magnetic needle, which starts to rotate. The presence of eddy currents may be inferred from the fact that a copper disk with radial slots cut in it produces little effect; the slots interrupt the eddy currents.
The inverse effect also occurs: a spinning bar magnet will cause a suspended copper disk to rotate.

The French physicist, Dominique Arago (1786-1853) discovered this effect in 1825 while studying the observation that the proximity of a piece of copper to a compass needle reduces the effect of the earth's magnetic field on the needle.

The Maynooth apparatus is by Yeates & Son of Dublin, and is ca. 1877. The Smithsonian apparatus is by Queen and cost $16.50 in 1889.


St. Patrick's College, Maynooth, Ireland


Smithsonian Institution
The example at the right of Arago's Wheel from the Garland Collection of Classical Physics Apparatus at Vanderbilt University is unmarked. The copper disk is 22 cm in diameter and the compass needle is 15 cm long. The base is made of walnut.
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:
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Labbie
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Re: arago disk

Post by Labbie »

:coffee: :w00t: Sorry would not take the picture, so perhaps Superbug you can google it.
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:
bigmack
Posts: 816
Joined: 15 Dec 2015, 10:49
Job Title: Lab Technician
School: FCAC
State/Location: QLD

Re: arago disk

Post by bigmack »

I made one years ago before I was a Labby after my Mrs saw one at Uni and said she had to have one . :oops:

The bearings are from the Head Drum assemblies of some old VCRs .
Disc.jpg
Disc 2.jpg
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bigmack
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Re: arago disk

Post by bigmack »

Labbie wrote::coffee: :w00t: Sorry would not take the picture, so perhaps Superbug you can google it.
Was something like this
Arago.png
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Labbie
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Re: arago disk

Post by Labbie »

yes
Regards Labbie

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Now retired :wub:
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superbug
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State/Location: NSW

Re: arago disk

Post by superbug »

wow wee, thats awesome!!! Bigmack
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