Re: [Harp-L] Fatigue and reed life




----- Original Message ----- From: "Joe and Cass Leone" <leone@xxxxxxxx>
To: "David Payne" <dave@xxxxxxxxxxxxxxxxxxxxxx>
Cc: <harp-l@xxxxxxxxxx>
Sent: Thursday, April 17, 2008 10:07 PM
Subject: Re: [Harp-L] Fatigue and reed life




On Apr 17, 2008, at 9:27 PM, David Payne wrote:



The Steel appears to me as virtually identical to brass reeds in thickness.

Because SS has a greater modulus of elasticity than copper alloy, it can be expected to be thinner where it flexes near the rivet. Because SS has a lower density than copper alloy, it can be expected to be thicker at the tip. If the SS reed is designed to have the same pitch and response to pressure as a copper alloy reed, then its geometry must be different. People in the past have made flat SS reeds and have then mistakenly drawn conclusions about the SS material. The differences that they could perceive playing the harp were differences in reed design.


If SS and Cu-alloy reeds had the same shape, the pitch of the SS reed would be very much higher because it would be both stiffer and lighter in weight.

Vern
Visit my harmonica website www.Hands-Free-Chromatic.7p.com







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