Date: Wed Feb 28 14:30:28 2007 Back to Contents

Author: Dan Beeker

Subject: Re: Cheap Fuses

Post:
We have a couple hundred analog meters, all with fuses. Have the same
problem. I am thinking of replacing the fuse with a PTC resistor. Has anyone
tried this?

Dan Beeker
Undergraduate Physics Lab Coordinator

Swain West 115
Physics Department, Indiana University
727 E. 3rd Street
Bloomington, IN 47405
Phone: (812) 855-5903
Fax (812) 855-5533
debeeker@indiana.edu

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Matt Harding
Sent: Wednesday, February 28, 2007 1:38 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Cheap Fuses


Here's 18 cents a piece (if you buy 'em by the hundreds)...
http://www.pbresource.com/mainad.html



-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Bill Norwood
Sent: Wednesday, February 28, 2007 12:19 PM
To: tap-l@lists.ncsu.edu
Subject: [tap-l] Cheap Fuses

Hi Tappers,

We burn out fuses here by the handfuls as students "learn" how to not create
short-circuits.

Does anyone know of boxful type of resource (very little money spent in
packaging) whereby I could get these for significantly less than $1.00 each?

fuse, 0.5 amp, AGX, 1/4 x 1 inch Bussman AGX-1/2

Many thanks,

Bill Norwood
Technician
Elementary Labs
Physics, U of MD, College Park
301-a405-6006


-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Paul Doherty
Sent: Wednesday, February 28, 2007 11:40 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] LabGuy Rot Suggestions

And of course the always memorable mercury beating heart demo!

Tony French showed us a movie of this experiment and we the students
demanded that he show it again and again.

Hm I wonder if its on Youtube yet?

Also I saw an early rectifier actually working in a South African
gold mining museum.
A 1/2 m diameter florence flask half full of mercury, with a point
just above the surface of the liquid.
The AC caused breakdown preferentially in one direction of electron
flow.
And the mercury surface didn't get pitted...for long.

Paul D

Who admits to rolling mercury around in his hands as a youth.



On Feb 28, 2007, at 7:42 AM, Santos Ramirez wrote:

> Talk about mercury vapor....
>
> Brings to mind
> a demo that consisted of a mounted vertical spring that had one end
> dipped in a mercury cup. A current was run through the spring and the
> mercury, causing the spring to contract. The end of the spring would
> lift out of the mercury, breaking the circuit. The spring would then
> drop, re-starting the process. You could see the vapor.
>
> Wonder if this is in a museum somewhere?
>
> Santos
>
>
>
>> "I'm doing asbestos I can!"
>>
>>
>> On Feb 27, 2007, at 12:12 PM, Sam Sampere wrote:
>>
>>> More for labguy rot...
>>>
>>> 'dems only mercury vapors. Don't need no stinkin' respirator.
>>>
>>> A little asbestos dust won't hurt ya.
>>>
>>> Get shocked by those open contacts once and you'll learn never to
>>> touch them again.
>>>
>>> Cough cough cough.
>>>
>>> Sam
>>>
>>> -----Original Message-----
>>> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-
>>> owner@lists.ncsu.edu] On Behalf Of Santos Ramirez
>>> Sent: Tuesday, February 27, 2007 12:25 PM
>>> To: tap-l@lists.ncsu.edu
>>> Subject: Re: [tap-l] LabGuy Rot Suggestions
>>>
>>> Bill,
>>>
>>> I think this list better reflects a "lab guy"'s requirements than
>>> someone that needs to quit. :) Might fit on a T-shirt. SR
>>>
>>>
>>> Could call it:
>>>
>>>
>>> YOU ARE A "LAB GUY" IF ...
>>>
>>>> A: Knows the location of everything in the Demo Room-- or at least
>>>> where it /was/ before someone borrowed it.
>>>>
>>>> B: Has every published edition of Halliday and Resnick.
>>>>
>>>> C: Personally knew Sutton.
>>>>
>>>> D: Knows the meaning of the the acronym "PIRA".
>>>>
>>>> E: Can set up any demonstration in any lecture hall on campus
>>>> in 10
>>>> minutes flat. And is frequently asked to do so at the last
>>>> minute...
>>>>
>>>> E: Has at least 195 of the "PIRA 200" demonstrations in their
>>>> department collection.
>>>>
>>>> F: Can explain even the most basic demonstrations to the most
>>> advanced
>>>> professors.
>>>>
>>>> G. Can recall the last dozen bars visited with Ziggy during AAPT
>>>> meetings. 10? 6? 1??
>>>>
>>>> Cheers.
>>>>
>>>> bill
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>
>







From tap-l-owner@lists.ncsu.edu Wed Feb 28 14:30:28 2007

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