We may here notice an empirical rule formulated by Nietzski in 1879: - the simplest colouring substances are in the greenish-yellow and yellow, and with increasing molecular weight the colour passes into orange, red, violet, blue and green.
He gave currency, moreover, to the empirical rule known as "Bode's Law," which was actually announced by Johann Daniel Titius of Wittenberg in 1772.
They reject the allowance for fatigue (that is, the effect of repetition) and design bridge members for the total dead and live load, plus a large allowance for impact varied according to some purely empirical rule.
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