Hier... Radio-Melkweg!

© Stichting IVIO

Before the advent of internet, people had to learn about the world by reading books. In the 1930s, a Dutch initiative started publishing booklets on a weekly basis about "Algemene Onderwerpen" (general topics). This became known as the AO-series. The series is still running (now on a monthly basis), the current edition is 3051.

In the week of the opening of the Dwingeloo Telescope, the topic of edition 605 in the AO-series was radio astronomy. The text, a nice introduction to radio astronomy, was written by dr. J. Houtgast, secretary of Stichting Radiostraling van Zon en Melkweg in 1956.

To appreciate the broad scope of the AO periodical, note that the surrounding editions were about "Easter Island" (604) and "Diseases from insects" (603).

I found one of these booklets online (it's actually A5-sized) and will deposit it in Astron's library. The booklet can apparently still be ordered.

I invite readers of the daily image to complete the crossword on the cover, which includes radio astronomical terms. Please note however that the submission deadline has passed by about 62 years.