Before revision: History Early versions of this instrument were patented in 1873 by the English engineer Edward Russell Morris.THE LONDON GAZETTE, DECEMBER 12, 1873 The instruments he produced were initially described as a Patent Chartometer although later versions were sold under the curious name of Wealemefna.Mathematical Instruments: Map Measurers Writing in 1881, Morris described how he had created a wholly original name in an attempt to outwit his imitators; he also refused to disclose the origin of the word.English Mechanic and World of Science: Vol.
After revision: of the opisometerHistory Early versions of this instrument were patented in 1873 by the English engineer Edward Russell Morris.THE LONDON GAZETTE, DECEMBER 12, 1873 The instruments he produced were initially described as a Patent Chartometer although later versions were sold under the curious name of Wealemefna.Mathematical Instruments: Map Measurers Writing in 1881, Morris described how he had created a wholly original name in an attempt to outwit his imitators; he also refused to disclose the origin of the word.English Mechanic and World of Science: Vol.