SN SN I own a Curta II in a plastic case, serialwith instruction leaflet and a copy of the yellow computations manual. This is in excellent used condition. Bought from Bryan Halladay in England and was used in rallying. I am learning to use it competently in historic rallying of my MGB Roadster.

Bring fact-checked results to the top of your browser search. In fact, calculation underlies many activities that are not normally thought of as mathematical. Walking across a room, for instance, requires many complex, albeit subconscious, calculations.

Computers, too, have proved capable of solving a vast array of problems, from balancing a checkbook to even—in the form of guidance systems for robots—walking across a room. Before the true power of computing could be realized, therefore, the naive view of calculation had to be overcome.

The inventors who laboured to bring the computer into the world had to learn that the thing they were inventing was not just a number cruncher, not merely a calculator. For example, they had to learn that it was not necessary to invent a new computer for every new calculation and that a computer could be designed to solve numerous problems, even problems not yet imagined when the computer was built.

They also had to learn how to tell such a general problem-solving computer what problem to solve. In other words, they had to invent programming.

They had to solve all the heady problems of developing such a device, of implementing the design, of actually building the thing. The history of the solving of these problems is the history of the computer.

That history is covered in this section, and links are provided to entries on many of the individuals and companies mentioned. In addition, see the articles computer science and supercomputer. Early history The abacus The earliest known calculating device is probably the abacus.

It dates back at least to bce and is still in use today, particularly in Asia. Now, as then, it typically consists of a rectangular frame with thin parallel rods strung with beads.

Long before any systematic positional notation was adopted for the writing of numbers, the abacus assigned different units, or weights, to each rod. This scheme allowed a wide range of numbers to be represented by just a few beads and, together with the invention of zero in India, may have inspired the invention of the Hindu-Arabic number system.

In any case, abacus beads can be readily manipulated to perform the common arithmetical operations—addition, subtraction, multiplication, and division—that are useful for commercial transactions and in bookkeeping. The abacus is a digital device; that is, it represents values discretely.

A bead is either in one predefined position or another, representing unambiguously, say, one or zero. As any person can attest, adding two digit numbers is much simpler than multiplying them together, and the transformation of a multiplication problem into an addition problem is exactly what logarithms enable.

This simplification is possible because of the following logarithmic property: Bytables with 14 significant digits were available for the logarithms of numbers from 1 to 20, and scientists quickly adopted the new labour-saving tool for tedious astronomical calculations.

Most significant for the development of computing, the transformation of multiplication into addition greatly simplified the possibility of mechanization.This video shows the method to write a logarithm as a sum or difference of logarithms. The square root of the term given is taken out as half according to the rule.

Then the numerator and denominator is divided into product of factors. This is broken into the difference of numerator and denominator according to the rule. Finally, the product of factors is expressed as the sum of factors.

Math Solver; Search the site ChiliMath. Free Math Help. You are here The logarithm of the product of numbers is the sum of logarithms of individual numbers.

Quotient Rule. The logarithm of the quotient of numbers is the difference of the logarithm of individual numbers. Rule 3: Power Rule. The logarithm of an exponential number is. curta calculator registry. Name: E-mail: Address: Phone (optional) CURTA(s) ** ** Rick Furr: rfurr(at)timberdesignmag.com `= ` (using calculator) Now.

RHS `= log 20 − log 5` `= − ` (using calculator) `= ` = LHS. We have shown that the second logaritm law above works for our number example. 1 Overview. Gmsh is a three-dimensional finite element grid generator with a build-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities.

(a). Use the properties of logarithms to write the expression as a sum, difference, or multiple of logarithms. ln(x 5vx5 + 6) (*b) Find the derivative of the function.

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use the properties of logarithms to write the expression as a sum, difference,