At the formidable seminars held at 4.30 on Fridays, which Batchelor instituted in 1948, many crucial theoretical developments were first presented, including his own.
At ang kakila-kilabot seminar isinasagawa sa 4.30 sa Biyernes, na kung saan Batchelor instituted in 1948, maraming mahalaga panteorya developments ay unang itinanghal, pati na sa kanyang sarili.