Barcus Berry Piano Pickups

[keys88]

I have an old Barcus Berry Model 1350 acoustic piano pickup. It works but I'm not sure where to place the two pickups on my grand piano.
One pickup is a flat surface and the other pickup is an upside down U shaped pick up.
I couldn't find a drawing of where to place the pickups. I know one should go under the piano on the sound board but which one and where?
Any help is appreciated.
Thanks
Paul

 

[happyrat1]

Maybe this will help?

Or ask a starving piano tuner