ידע וזיכרון

The Slide Rule as a Logarithmic Arithmetic Engine

תוכן האובייקטים עצמם כתוב באנגלית ועדיין לא תורגם.

תקופה ומקור

Seventeenth century onward, following Napier’s logarithms and Gunter’s scale; the central engineering computer until electronic calculators

מה הוא נבנה לעשות

To multiply and divide by sliding, so that a hard operation becomes an easy one.

כיצד המנגנון פועל

A positive quantity is represented by a position proportional to its logarithm. Sliding one scale by one operand’s position makes the other operand align at the sum of the two positions, which is the product. A cursor distributes one alignment across several scales.

קלט

Two positive quantities, set as positions on logarithmic scales.

טרנספורמציה

Physical addition of lengths, which is multiplication of the quantities they encode.

פלט

The product or quotient, read at the alignment.

מה מבוסס בראיות

מבוסס: הממצא או התיעוד נושאים זאת במישרין.

מה הוא מדגים

The most economical statement in the series: change the representation and the operation changes with it. Multiplication becomes translation.

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