Pianotech

It looks like one I have from Renner  I believe. It can calculate string tensions/lengths/sizes, also has functions for bass strings.

As an apprentice, my job was to measure all the string lengths and calculate the tensions for all the unwound strings. Obviously before computers generated the first very thick hard copy readout of all that info.

Not much good without the book; I'll see if I can dig it up.

It looks like one I have from Renner  I believe. It can calculate string tensions/lengths/sizes, also has functions for bass strings.

As an apprentice, my job was to measure all the string lengths and calculate the tensions for all the unwound strings. Obviously before computers generated the first very thick hard copy readout of all that info.

Not much good without the book; I'll see if I can dig it up.

TF 65/2 duplex slide rule : for figuring the lengths, diameters, tensions and inharmonicity coefficients of all strings for pianos, harpsichords, etc.

There is also this book in the library, please go to this website 

https://search.worldcat.org/en/title/17708195

You go to this library to borrow this book。

Or if anyone is interested, and is close to this library, you can borrow it.

Clicking more info at that link indicates a 31 page booklet and it also says that it is in English. Maybe someone posting here can find the booklet.

book

<<Fachkunde Klavierbau>>
U. Laible

P88-P102

book

<<Fachkunde Klavierbau>>
U. Laible

P88-P102

No, Sorry Arnold, it is a specialty slide rule developed by Klaus Fenner to determine proper string sizes/tensions for pianos and harpsichords called the TF 65 or TF 65/2

No, Sorry Arnold, it is a specialty slide rule developed by Klaus Fenner to determine proper string sizes/tensions for pianos and harpsichords called the TF 65 or TF 65/2

book

<<Fachkunde Klavierbau>>
U. Laible

P88-P102

The T65 does appear in the book with examples on how to use it, but that's shown with a different image.

Best regards,

Arnold

No, Sorry Arnold, it is a specialty slide rule developed by Klaus Fenner to determine proper string sizes/tensions for pianos and harpsichords called the TF 65 or TF 65/2

book

<<Fachkunde Klavierbau>>
U. Laible

P88-P102

OK, That may well be the case but this thread has been about the TF 65 or TF 65/2. BTW, would you happen to know the difference between 65 and 65/2?

Respectfully,

Tremaine

The T65 does appear in the book with examples on how to use it, but that's shown with a different image.

Best regards,

Arnold

No, Sorry Arnold, it is a specialty slide rule developed by Klaus Fenner to determine proper string sizes/tensions for pianos and harpsichords called the TF 65 or TF 65/2

OK, That may well be the case but this thread has been about the TF 65 or TF 65/2. BTW, would you happen to know the difference between 65 and 65/2?

Respectfully,

Tremaine

The T65 does appear in the book with examples on how to use it, but that's shown with a different image.

Best regards,

Arnold

No, Sorry Arnold, it is a specialty slide rule developed by Klaus Fenner to determine proper string sizes/tensions for pianos and harpsichords called the TF 65 or TF 65/2

book

<<Fachkunde Klavierbau>>
U. Laible

P88-P102