This is the Katz Adder produced by Rogers of Canada in 1950. Full details are given in the large attached PDF file.
Summary: A Novel switching tube embodying complete matrices or function tables. A tube capable of performing the binary addition of two digits and a 'carry' from a previous stage. Extensions are sketched to binary subtractor, binary adder - subtractor, multiplier, 3 x 8 matrix and other types.
The basics of the design layout.
A cut-away view of the interior,
Plan view of the electrode arrangement.
Thanks to Simon Lavington for providing the information and Dr James Peters (Archivist, University of Manchester) for the PDF file.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 59 mm tall.
References: Datasheet, 1040 & 1043. Type XA3446 was first introduced in 1950.