For isochronous Hartnell governor
(a) mg + S1 / mg + S2 = r1/r2
(b) mg – S1 / mg – S2 = r2/r1
(c) S1/S2 = r1/r2
(d) S2/S1 = r1/r2
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I need to ask this question from Porter Governor topic in portion Governors of Machine Dynamics