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 114
Fig. 26. A special lever is fitted on the side of the setting levers which prints witheach single factor the signs +, —, x , -+,-£, lbs., etc., as the case may be. A further new type of the Brunsviga is the Trinks-Triplex (fig. 28), which,as is implied by its name, is really three machines in one.… … Fig. 27. actuated by one handle. For instance, two separate multiplications can becarried out at the same time by turning the handle, and by a special devicethe product register can be zeroised as a whole or in separate parts. The latest product of the factory is the machine as illustrated in fig.…
