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Science Portable Battery Charger featuring the photograph Step Reckoner Leibniz Mechanical #4 by Science Source

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Step Reckoner Leibniz Mechanical #4 Portable Battery Charger

$54.00

This product is currently out of stock.

Size

Orientation

Image Size

 
 

Product Details

You'll never run out of power again!   If the battery on your smartphone or tablet is running low... no problem.   Just plug your device into the USB port on the top of this portable battery charger, and then continue to use your device while it gets recharged.

With a recharge capacity of 5200 mAh, this charger will give you 1.5 full recharges of your smartphone or recharge your tablet to 50% capacity.

When the battery charger runs out of power, just plug it into the wall using the supplied cable (included), and it will recharge itself for your next use.

Design Details

Leibniz may have been the first computer scientist and information theorist. The Step Reckoner (or Stepped Reckoner) was a digital mechanical... more

Dimensions

1.80" W x 3.875" H x 0.90" D

Ships Within

1 - 2 business days

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Step Reckoner Leibniz Mechanical #4 Photograph by Science Source

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Portable Battery Charger Tags

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Photograph Tags

photographs science photos technology photos history photos historic photos historical photos invention photos step reckoner photos stepped reckoner photos mechanical calculator photos leibniz photos gottfried leibniz photos counting wheel photos diagram photos illustration photos schematic photos

Artist's Description

Leibniz may have been the first computer scientist and information theorist. The Step Reckoner (or Stepped Reckoner) was a digital mechanical calculator invented by German mathematician Gottfried Wilhelm Leibniz around 1672 and completed in 1694. It was the first calculator that could perform all four arithmetic operations addition, subtraction, multiplication and division. Its intricate precision gear work, however, was somewhat beyond the fabrication technology of the time; mechanical problems, in addition to a design flaw in the carry mechanism, prevented the machines from working reliably. Despite the mechanical flaws of the Stepped Reckoner, it gave future calculator builders new possibilities. The operating mechanism, invented by Leibniz, called the stepped cylinder or Leibniz wheel, was used in many calculating machines for 200 years, and into the 1970s with the Curta hand calculator.

 

$54.00