[Leica] IMG: Contact !

[Jim Nichols]

Douglas, after 40 yrs exposure to an industrial environment, my ears 
hear only a slight tinkle from them.

On 7/9/20 10:48 AM, Douglas Barry wrote:
> Chimes on a windy night? I hope they're not too close to your bedroom 
> window!
>
> On 09/07/2020 15:28, Jim Nichols wrote:
>> I checked the  chimes with a magnet, and the material is 
>> non-ferrous.  It appears that the chimes and clapper are cut from the 
>> same tubing material, which appears to be aluminum.  From my 
>> university days in the 1940s, I recall that one of the popular 
>> aircraft materials was called ALCLAD, which was an aluminum alloy 
>> protected by a coating of pure aluminum to resist the effects of 
>> corrosion.
>>
>> I must assume that the continuous tapping of the clapper causes some 
>> type of reaction in the material.
>>
>> On 7/9/20 8:35 AM, Philippe via LUG wrote:
>>> The culprit will be the horizontal clapper, made of a different 
>>> material. Electrolysis over time and banging will have depositied a 
>>> thin layer over the protective skin of aluminium oxide.
>>>
>>>
>>> Amities
>>>
>>> Philippe
>>>
>>>
>>>
>>>> Le 8 juil. 2020 à 19:16, Jim Nichols <jhnichols at lighttube.net> a 
>>>> écrit :
>>>>
>>>> These old aluminum chimes have oxidized from years of contact.
>>>>
>>>> http://www.gallery.leica-users.org/v/OldNick/20200708-P7082399.JPG.html 
>>>>
>>>>
>>>> -- 
>>>> Jim Nichols
>>>> Tullahoma, TN USA
>>>>
>>>>
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>>>
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>
>
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>
-- 
Jim Nichols
Tullahoma, TN USA