The Arithmetic of Clocks 11d--.
The Gaussian-School of Higher-Arithmetic (1831, updated 2022); tutorial #21 page 11d.
The Arithmetic of Clocks, page 11d.
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The Gaussian-School of Higher-Arithmetic (1831, updated 2022); tutorial #21 page 11d.
The Arithmetic of Clocks, page 11d.