SU30480A1 - Slide rule - Google Patents

Description

The proposed slide rule refers to the type of multistage rulers, i.e. those in which the Liiyaki scale is divided into several equal parts. Long-existing flat two-stage rulers, differing from ordinary single-stage doubled magnified scales, have the drawback that the reading of the result of the calculation on the ruler must be found on which part of the upper or lower scale to read the result of the calculation, especially difficult to produce actions with many factors.

By means of the proposed slide rule, it is meant to achieve the elimination of the above defects.

In FIG. 1 shows a ruler view from above; FIG. 2 and 3 are the same in different positions and FIG. 4-ruler in cross section.

The slide rule is equipped with a double scale, applied on the upper part 3 to 4 lines, and another and the same two-step scale, applied on the lower parts 5 and 6 of the ruler. The flat slider of the ruler is designed so that it can have movement along the ruler parallel to its scales and a second movement across the ruler — perpendicular to its scales. Two two-stage scales are applied on the engine: one is painted with black paint and the other is reverse red.

The proposed device engine in the ruler with a double two-step scale reaches the possibility with each action of the account to see against one of the final indices 7 and 2 of the engine, the result of the account.

For the production of multiplication, the factors of factors are placed one below the other, one on the ruler, the other on the engine on the reverse scale (red veta) —and the result is read against the final index of the engine. For example (Fig. 2) 5X8 40. Indicators 5 and 8 are placed one below the other with the help of the sighting line 7-8 of the slider 9. Result 4 is seen against the index / (Fig. 2). When dividing one number and another, the divisor mark on the direct black scale of the slider is set against the divisible mark on the ruler scale, the result is counted on the ruler against the slider index /. For the production of multiplication, for example, or division, use the method described, but

and t;

.

§

| ".

m

"