Rosenhain published a large number of papers and addresses, and his highly trained staff also did much writing, covering the whole field of physical metallurgy, ferrous and non-ferrous. In 1908 Rosenhain published his book on "Glass Manufacture", a second edition of which, largely re-written, appeared in 1919. Another volume was published in 1914, "An Introduction to the Study of Physical Metallurgy", 2nd edition 1916, frequently reprinted. A third edition, revised and partly rewritten by John L. Haughton, was published after Rosenhain's death, in 1935. Towards the end of 1915 he delivered the Cantor lectures on optical glass before the Royal Society of Arts. These lectures were published as a pamphlet in 1916. In the following year he wrote the essay on "The Modern Science of Metals" for "Science and the Nation, Essays by Cambridge Graduates". In 1927 he was appointed British delegate on the permanent committee of the International Association for Testing Materials, and was elected its president at the Zurich congress held in 1931. Rosenhain was a good linguist and gave lectures and addresses in many countries. He resigned his position at the National Physical Laboratory in 1931 to take up practice in London as a consulting metallurgist.