[Leica] IMG: Contact !

[Jim Nichols]

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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-- 
Jim Nichols
Tullahoma, TN USA