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An apparatus consisting of a graduated limb (3), in which a circle (4) is inscribed, only visible in the figure through a window provided with a lattice (8). Another lattice (9) is arranged in a window (5) joined to an arm (2) capable of a turning movement on the copy axis of the outer limb and the inner circle. By means of a brake device operated by a button (6), it is achieved that the central circle is dragged by the rotation of the arm (2) or is fixed, detached from the movement of said arm. The inner circle is provided on its edge with another graduated limb. The two limbs to which we have referred are divided into parts proportional to the scale of the logarithms, and marked these divisions following the natural scale of numbers. In this way, when we juxtapose or add geometrically two arcs of these limbs, the reading of the result will correspond to the product of the readings of the cited arcs, and thus analogously for the other arithmetic operations. (Machine-translation by Google Translate, not legally binding)
Improvements in the provision of graduated scales and any other notes on thermometers and other scientific or clinical instruments, of glass or glass (Machine-translation by Google Translate, not legally binding)