South India Philatelists' Association, Chennaiさんのイラストまとめ
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South India Philatelists' Association (SIPA), Chennai which was founded with 5 philatelist in the year 1956 for promoting philately among all walks of life.
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#OTD
On 8 Nov 1895.
While experimenting with #electricity, Wilhelm Röntgen discovered the X-ray.
A German mechanical engineer, #physicist, who, on 7/8 Nov 1895, produced and detected #electromagnetic #radiation in a #wavelength range known as X-rays or Röntgen rays.
#philately
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