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Subject:
From:
David Pickett <[log in to unmask]>
Reply To:
Harpsichords and Related Topics <[log in to unmask]>
Date:
Mon, 22 May 2017 14:15:34 +0200
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Yes.  It is too long.

There is not much variation of density between 
different makes of brass wire.  Malcolm Rose 
quotes 3.8kg as the maximum recommended tension 
for his 0.25 mm (0.010") diameter English Brass wire.

A 630mm long string at 261.6 (and ET middle C at 
A = 415.3) would have a tension of 4.79 kg.  A 
string of the same length with a tension of 3.8kg 
would be tuned to the Bb below middle C.  Very much touch and go.

An octave higher the figures would be 4.6 kg for 
a .23 mm diameter string (max tension for this 
string recommended by Rose = 3.2 kg).

Dongsok is correct.

David


At 12:34 22-05-17, dc wrote:
>Le 22/05/2017 12:07, Dongsok Shin écrit :
>>The design was changed at least a few times. 
>>But I am certain that if you put all brass on 
>>the one you have and try to pull it up to 440 
>>you will break strings left and right. Try one and see!
>>Dongsok
>
>Thanks, Dongsok.
>
>Would anyone have the scaling of their all-brass model?
>
>Middle c is 630mm in this instrument and c2 is 
>340mm. Is that too long for brass?
>
>Thanks.
>
>Dennis
>
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Note:  opinions  expressed on HPSCHD-L are those of the  individual con-
tributors and not necessarily  those of the list owners  nor of the Uni-
versity of Iowa.  For a brief  summary of list  commands, send mail to
[log in to unmask]  saying  HELP .
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