Equilibrium is restored by hanging rider weights on the beam. Four riders are supplied. The largest, when it is placed on the hook from which the plummet hangs, denotes a specific gravity of 1000, that of distilled water. On the notch marked 9 itanbsp;...
|Title||:||Manual of public health|
|Author||:||John Ronald Currie, Alexander Gow Mearns, Margaret Wolfe Jepps, Robert Arnot Staig|