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by Omikron/Yerkes Observatory
$54.00
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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
Joseph von Fraunhofer demonstrating his 1814 invention, the spectroscope, a device used to examine properties of light. Photogravure from a painting... more
Dimensions
1.80" W x 3.875" H x 0.90" D
Ships Within
1 - 2 business days
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Joseph von Fraunhofer demonstrating his 1814 invention, the spectroscope, a device used to examine properties of light. Photogravure from a painting by Richard Wimmer. Joseph von Fraunhofer (March 6, 1787 - June 7, 1826) was a German optician. One of the most difficult operations of practical optics was to polish the spherical surfaces of large object glasses accurately. Fraunhofer invented a machine that rendered the surface more accurate than it was left by the grinding. He invented other grinding and polishing machines, and introduced many improvements into the manufacture of the different kinds of glass used for optical instruments. In 1814, Fraunhofer invented the spectroscope. He discovered that bright fixed line which appears in the orange color of the spectrum when it is produced by the light of fire. This line enabled him to determine the absolute power of refraction in different substances. Experiments to ascertain whether the solar spectrum contained the same bright line in...
$54.00
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