strict temperature effects

[Jim Coleman, Sr.]

Hi Jim:

IAK  I am confused. I have had many experiences where when the air 
conditioner came on while tuning, the mid range area pitch rose sometimes
as much a 2 cents. Your data shows a change in the opposite direction.
Do you suppose that in my case the strings responded befor the plate 
responded?  My thinking has always been that the wire when colder has a 
greater tensile strength and when it is colder, it is more flexible and 
yields more readily.

The drop in humidity is probably a result of the raising of the temperature.
The amount of moisture in the air probably had not changed to speak of.
I have done many tests of tuning forks, and the pitch always lowers when
the temperature raises. I can understand that. I just don't understand
this yet.

I do know that Band instruments rise in pitch as they are played and warmed
up. in this case I believe that the column of air is what changes the pitch

Jim Coleman, Sr.


On Fri, 13 Mar 1998, JIMRPT wrote:

> 12 o'clock EST, temp. 44 deg. F (6.5 deg. C ?), humidity 73%
> 5 o'clock EST,  Temp.  61 deg  F (12 deg C?), humidity 65%
> 
> Using the meas. mode of the SAT II each reading was taken three times and the
> results averaged for reading. Readings taken on S&S Model 'V'. Readings
> indicate cents below A440 scale ?
> 
>                BI                        A4                   G6
> 12:00	-71.6     			-50.8			-40.1
> 5:00    	-63.8				-47.3			-32.3
> 
> 
> I personally don't have much confidence in the B1 readings but the other two
> were solid takes.  Interesting that the curve pretty much follows the other
> list that was posted.
> For what it's worth.
> Jim Bryant (FL)
>