1 of

|

T-Shirt Reviews (2886)

Average Rating (4.34 Stars):

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 the orange...

Shop with Confidence

Our return policy is very simple:

 

If you're not happy with a purchase that you made on FineArtAmerica.com, for any reason, you can return it to us within 30 days of the order date.   As soon as it arrives, we'll issue a full refund for the entire purchase price.   Please note - Fine Art America does not reimburse the outgoing or return shipping charges unless the return is due to a defect in quality.

 

Fine Art America sells thousands of pieces of artwork each month - all with a 100% money-back guarantee.   We take great pride in the fact that hundreds of thousands of artists have chosen Fine Art America to fulfill their orders, and we look forward to helping you select your next piece!

Delivery

All t-shirts ship from our production facility within 1 - 2 business days of your order.