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A discussion of the most common phone scams, how they work, and how to protect yourself from them.

From BLOG@CACM
#### The Calculating Machine from the Concentration Camp

The story of Viennese engineer Curt Herzstark and the world's smallest mechanical calculating machine, the Curta.

From BLOG@CACM
#### Original Roman Pocket Calculators are Extremely Rare

As far as we know, only three or four original specimens of the Roman hand abacus have survived.

From BLOG@CACM
#### Patent Protection in Europe

Up to the second half of the 19th century —with the exception of the industrial power Great Britain—the protection of inventions was inadequate and strongly disputed...

From BLOG@CACM
#### Computers Were Originally Humans

Until the middle of the 20th century, computers were in fact humans who performed calculations.

From BLOG@CACM
#### How Does One Divide with Napier's Rods?

Napier's multiplication and division rods, deriving from the basic multiplication table, simplify calculations considerably.

From BLOG@CACM
#### How Does One Multiply with Napier's Rods?

Napier's multiplication and division rods, deriving from the basic multiplication table, simplify calculations considerably.

From BLOG@CACM
#### How Does One Calculate With A Circular Slide Rule?

The circular slide rule was widely used until the 1970s.

From BLOG@CACM
#### The Evolution of Computing Power in Switzerland

Milestones in the history of computing from the Swiss National Supercomputing Center, Lugano.

From BLOG@CACM
#### Soresini: A Very Rare Book on the History of Computing

The work is an extremely instructive, rich history of calculating technology. It also includes the analog world and automata, and is written in Italian.

From BLOG@CACM
#### Charles Babbage and the Loom

Babbage wanted to control his analytical engine, regarded as the ancestor of the modern-day computer, with punched cards.

From BLOG@CACM
#### The World's Most Magnificent Historical Calculating Machines

The design of today's electronic computers is usually not very appealing, in contrast to magnificent mechanical calculating machines from earlier times.

From BLOG@CACM
#### The World's Most Magnificent Historical Automatons

Automatons are ubiquitous. Some of the most magnificent works in the genre have survived in museums.

From BLOG@CACM
#### Konrad Zuse's Guestbook: a Treasure Trove

Computer scientist Konrad Zuse created the world's first programmable computer, the functional program-controlled Turing-complete Z3.

From BLOG@CACM
#### An Enigmatic Device from Denmark

Discovery of a very rare surveying instrument in Denmark.

From BLOG@CACM
#### How Do You Calculate on the Abacus?

Considering the use of one of the most long-lived calculating devices.

From BLOG@CACM
#### Tracking Down a Seminal Work on Computer Construction – in Russian

A Russian edition of Rutishauser's standard work on computer construction.

From BLOG@CACM
#### Discovery: User Manual of the Oldest Surviving Computer in the World

A rare find: the user manual of the oldest surviving computer in the world, the Zuse Z4 relay machine (1945).

From BLOG@CACM
#### Preparation for Building the First Swiss Digital Computer (Ermeth)

Eduard Stiefel's study trip to the U.S. in 1948/1949.