In order to successfully cast a line of type, the line of matrices needs to fill up the complete length of the desired line. If it does not, the type metal will be poured between the matrices, and will block the machine.
To fill the complete length of the desired line exactly, Rogers developed round spaces for the Typograph. They consist of two parts: one round part that gradually goes from thin to thick, and a smaller part with a hook that is sticking out:
Photo: Front views and a side view of the round spaces
The pin keeps the small part of the matrix on the same position. The round circle is the part that will rotate:
Video: The two moving parts of a round space illustrated
The pin is positioned in a groove below the space. But to rotate the round part, the spaces are mounted on a square bar. The machine will rotate that bar, which takes the spaces with it. The bar keeps rotating till the whole line of matrices is justified over the length of the line. The video belows shows how the spaces are positioned between the matrices, and how they get wider till the matrices are justified over the whole length of the line:
Video: The Typograph justifying the matrices over the whole length of the line; notice the spaces (grey metal between the matrices) getting wider
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