hen some portion of the metal As the violet-blue tints are the most beautiful, we it can be turned only by means of a key adapted to gives way, and the ponderous boiler is hurled have devoted most of our attention to them, and have it, and this key may be kept within the control of through the… … rangement of the parts being made to brown in a-few hours, deposi- MANN'S IMPROVED SAFETY GUARD FOR STEAM BOILERS manifest to any inspector of the ting a black powder, which be- comes blue dissolved in alcohol, and red in acids. boiler. boiler is in use, and thus it will be out of the power The…
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