An optical extensometer was devised for measuring the linear expansion and contraction of slid blocks of coal occurring during the adsorption or desorption of moisture from the surrounding atmosphere.
Reference:
Meintjies, A. 1963. A recording optical extensometer. http://hdl.handle.net/10204/12966 .
Meintjies, A. (1963). A recording optical extensometer Retrieved from http://hdl.handle.net/10204/12966
Meintjies, AA A recording optical extensometer. 1963. http://hdl.handle.net/10204/12966
Meintjies A. A recording optical extensometer. 1963 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/12966
