The main heart of the direct multiplication is a block of brass representing nine rows or ranges of pins. Each row (R) contains 9 pairs of pins the lengths of which represent the products of R by 1, 2, 3, 4, etc.
The picture opposite shows in the forefront the row “9” with its pairs of pins corresponding (from right to left) to the products of (9 x 1), (9 x 2), (9 x 3), etc.
When the block is mounted in the body of the machine, the rows are presented vertically, with the row “9” at the bottom and the row “1” on top.
For a detailed description of this mechanism, please consult the webpage of John Wolff (The multiplier mechanism).