This is actually the second, posthumous edition of a book first published in 1937.
Herman Mayerowitsch was born on June 13th, 1882, in Deraznia, a small town in Russia where his father was buergermaster or mayor. At an early age he went with his parents to Czortcow (then Austrian Poland). He had a natural gift for singing, and at the age of 22 was appointed Chazan (Cantor) at Peczel, near Budapest. Later he went to Stuhlweisenburg, Hungary and in 1910 he was appointed Chazan in Misslitz, Czechoslovakia. He passed the State Examination in Music at the Vienna Conservatoire and from 1913 to 1921 he was Oberkantor of the Muellner Tempel and Lecturer in Liturgy and Music at the Seminary for Religious Teachers in Vienna.
On passing through England on his way to visit America, he was invited to apply for positions in Liverpool, Birmingham and the Great Synagogue in London. He accepted the appointment as Chazan at the Great Synagogue, the cathedral synagogue of Ashklenazi Anglo-Jewry in Dukes Place, Aldgate.
For a number of years he was President of the Chazanim Association and was also Lecturer in Liturgical Music and Chazanuth at Jews College in London.
The Great Synagogue was totally destroyed in the Blitz in 1940. During war Herman Mayerowitsch acted as air-raid warden in the danger zone of the City, and he took part in rescuing some of the property of the Great Synagogue when it was destroyed. He continued to sing in a temporary building on the site. He died on November 28th, 1945.
The tunes that he transcribed in his book, some of which I have scanned below, include the composers and the names of the families where these particular melodies were traditionally sung.
Jewish Miscellanies 
This is a real gem in the trove!
Hopefully some talent will bring life to the notations soon.
Brilliant find, Jeff.