Technology 1884 in science

^ u.s. patent 293,545.
^ #33/256. bollettino delle privative industriali del regno d’italia 2nd series 15 (1884) pp. 635–655.
^ mccallum, iain (1999). blood brothers – hiram , hudson maxim: pioneers of modern warfare. london: chatham publishing. p. 49. isbn 978-1-86176-096-8. 
^ kane, joseph nathan (1997). famous first facts: record of first happenings, discoveries , inventions in united states (5th ed.). h. w. wilson. p. 605. isbn 0824209303. 
^ winter, lumen; degner, glenn (1933). minute epics of flight. new york: grosset & dunlap. pp. 49–50.