The Wheatstone instrument in the form devised by Stroh is still largely used in the British Postal Telegraph Department.
Stroh, from a knowledge of the results, was able to verify and extend the results by the symbolic method.
Single binary forms of higher and finite order have not been studied with complete success, but the system of the binary form of infinite order has been completely determined by Sylvester, Cayley, MacMahon and Stroh, each of whom contributed to the theory.
Sylvester, Cayley and MacMahon succeeded, by a laborious process, in establishing the generators for 0=5, and 0=6, viz.: 5 15 531 1 -z 2.1-z 3.1-z 4.1-z 5 ' 1-z2.1-z3.1-z4.1-z5.1-z6' but the true method of procedure is that of Stroh which we are about to explain.
It was noted that Stroh considers Method of Stroh.-In the section on " Symmetric Function," (alai +a 2 a 2 +...
Stroh assumes that every reducible seminvariant can in this way be reduced.