I hereby certify that the above work is entirely my own.
(Signed)
Transcriber’s Note
Minor punctuation errors have been corrected. Hyphenation has been made consistent.
The following amendment has been made:
Page [20]—extention amended to extension—... is a small extention on which an iron roller is placed.
The frontispiece illustration has been moved to follow the title page. Other illustrations have been moved where necessary so that they are not in the middle of a paragraph.