Let me ask my instructor about Manoly and see if he knows or even has anything.

All I know about him is what I've been able to find on the internet. Below is the only photo of him that I've ever seen:

Ludwig Manoly

Ludwig Manoly was formerly a star choir singer as a boy. When his voice changed upon passing through puberty, ruining his chances to audition for the conservatory as a singer, Manoly decided to give up the choir for the bass around 1870 having qualified for a bass scholarship the school was offering.

After leaving the conservatory in 1876, Manoly emigrated to the United States where he first joined the Boston Symphony Orchestra and then became the principal bassist of what would become the New York Philharmonic. He knew many composers including Tchaikovsky, Brahms, Liszt, Verdi, Saint-Saëns and the Strausses—Richard, Johann and Eduard. Anton Dvorak appointed him bass teacher at the National Conservatory of Music in New York. One of his most influential students was Herman Reinshagen who became assistant principal bassist in the New York Philharmonic under Manoly and the principal bassist when Manoly left to join the Metropolitan Opera Orchestra.