Astronomers collaborate

The formation of the Cornell‐Sydney University Astronomy Center has been announced. The instruments available for members of the new center are:

1. The Arecibo Ionospheric Observatory in Puerto Rico, which has the world’s largest dish‐type radar‐radio telescope with a 1000‐foot diameter bowl‐shaped antenna.

2. The new Mills Cross radio telescope being built twenty miles from Canberra, Australia, at the Molonglo Radio Observatory. The arms of the cross are each about one mile in length and 40 feet wide. The telescope will be the largest of its type in the world. The E‐W arm is scheduled to begin operating in a few months, and will be used in an observational program even before the N‐S arm is finished.

3. Three other cross‐type radio telescopes: the Criss Cross, the Shain Cross, and the original Mills Cross, all located near Sydney.

4. A new stellar intensity interferometer which recently began operating at Narrabri, Australia. The instrument has two 22‐foot composite minors, mounted on trucks, which run on a circular railway track 600 feet in diameter. The reflectors are aimed at a particular star In automatic controls, and the signals received are electronically correlated.