Mainly in Edinburgh-based journals, Sang wrote extensively on mathematical, mechanical, optical and actuarial topics including vibration of wires, a theory of toothed wheels, an improved lighthouse light, railways, bridges, manufacturing and life insurance.
Pangunahin sa Edinburgh-based journal, sang wrote nang husto sa matematika, de-makina, sa mata at actuarial paksa kabilang ang panginginig ng boses ng wires, ang isang theory ng mga ngiping wheels, isang pinabuting parola ilaw, railways, Bridges, pagmamanupaktura at seguro sa buhay.