Holyoke Warter Power Co. , Experiments with Gears, Belts and Draft Tubes, [۲](https://books.google.com/books?id=HD1EAAAAMAAJ&pg=PA73) Holyoke Hydrodynamic Experiments], Weaver Shipman and Co. , Springfield, Mass. , 1880; pages 73-76.
Coleman Sellers, Transmission of Motion, [۳](https://books.google.com/books?id=XNgGAAAAYAAJ&pg=PA314) Journal of the Franklin Institute], Vol. LXIV, No. 5 (Nov. 1872); pages 305-319, countershaft is defined on page 314, jack shaft on page 316.
John J. Flather, [۵](https://books.google.com/books?id=q5dKAAAAMAAJ&pg=42) Rope-Driving: A treatise on the transmission of power by means of fibrous ropes], Wiley, New York, 1895; pages 42-43. Fig. 21 shows part of the jack-shaft.
James Hindman and William Hindman, Improvement in the Grist Mill, [۹](https://books.google.com/books?id=xaM1AQAAMAAJ&pg=PA324) The American Journal of Improvements in the Useful Arts and Mirror of the Patent Office in the United States], Vol I, No. 3 (July, Aug. and Sept. 1828); page 324. This reads like a patent application, there is no record of a corresponding patent.
Robert Willis, Part the Third, Chapter II -- To Alter the Velocity Ratio by Determinate Changes, [۱۰](https://books.google.com/books?id=Ty84AAAAMAAJ&pg=PA433) Principles of Mechanism Designed for the Use of Students in the Universities and for Engineering Students Generally], John W. Parker, London, 1841; page 433.
