Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 103
o thequotient-register. On account of difficulties of construction, this mechanismhas in almost all Thomas machines no carrying arrangement. But in the Archimedes this difficulty has been solved. The advantage of the solutionis extremely important, especially in contracted methods of calculation.… … Fig. machines built on the Odhner system are toothed wheels with a variablenumber of teeth, in contrast to the Thomas system, which employs steppedcylinders or reckoners. The disadvantage resulting from this arrangementof the Thomas machine, namely, that the individual digits of large numbers…
