fficult to be- ferent from those of the ores of other metals. Many amples of this phenomenon are presented by the sun, lieve that the delicate filament is not in some way im- other metals occur in well-defined fissure veins, so that moon, and stars. The sun, viewed with thenaked eye, mensely… … the acid of which combines with the lime while the on the part of the engineer in charge of the works to fied by a smoked glass. The crescent of the moon ap- acid is liberated. The effect produced is, however, keep up a regular and steady output of ore. pears to project beyond the moon’s periphery…
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-205-117.webp)
