and that copper tubes exceeded those of brass thirtyone per cent We observed that the accuracy of the experiments was doubtful, and our doubts we perceive are confirmed by the last issue of the ...

Calvert and Johnson made a series of experiments with pretty large masses ... quantity of zinc much exceeded 50 per cent of the copper, the brass produced was very brittle. A beautiful brass ...

Heat causes a fusion of zinc and copper to form brass (gold-colored ... The Zn compound can stick to the pennies, so experiment with the placement of the pennies to minimize this occurrence. This ...