On the January meeting the belief was expressed that an English summary could provide a real service to our foreign readers. As an experiment, each Bulletin will carry short summaries of the articles in the previous Bulletin.
Reactions are very welcome.
I am not a native English speaker, nor a mathematician, so help is always appreciated. Fer found that the inside of the ring contains few secrets. There are two patterns, one for spring and summer and one for autumn and winter. To avoid having the light ray deviate too much, one of three holes is used according to where the spot is to fall, nearer the edges or nearer the middle. The outside of the ring bears a chart.