Easy Sentences in the Hakka Dialect, with a Vocabulary was first published in Hong Kong in 1881. It came about because Ball who was learning to speak Hakka at the time, decided to translate the earlier work Handbook of the Swatow Dialect with a Vocabulary by Herbert Allen Giles (1877).
Since Ball’s translation is partly unvailable in some places, I have transcribed the pages and created a pdf for the interested reader.
With regards to the layout of the work is slightly different to the original. The only scans that I have available, omit the introduction, whereby Ball would have outline how this work came about, and some notes on the pronunciation and advice for the student, as found in his other work for Cantonese.
This file in the link below is not a scan of the original book. The author James Dyer Ball died in 1919, and Herbert Allen Giles died in 1935. The copyright expired then at 70 years after Giles passed away, so it became a public domain book in 2006.
The file can be downloaded here : JDB-EasySentencesHakkaDialect
A guide to the pronunciation of Hakka is perhaps apt, to fill in the gap due to the missing Introduction.
Edit Notes : A couple of changes were made to the pronunciation guide to correct spacing and character errors. Some additional notes were added Friday 6th June 2017