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Updated: July 27, 2025
In answer to this, it may be observed, that if a number of strata differing greatly in composition from each other be subjected to equal quantities of heat, or hydrothermal action, there is every probability that some will be much more fusible or soluble than others.
Now I will teach you the other way, and the best that is to water your red fixt Stone or powder with the red Oil, that it be fusible; you must know how much your red powder weighs, then take half the weight of your red Oil, to the full weight of the Stone, and poure it upon the red powder, and when the Oil is poured into the Glass, you may set a small head on, upon a Furnace in sifted Ashes, joining a Receiver to the Nose of the head, make a small fire under it, as the heat of the Sun in March, and no hotter; for there is yet some moisture of the Vinegar in the Oil, that it may be abstracted, continue it in that heat, that can perceive no moisture in the Head, then augment the fire a little, as the heat of the Sun at Midsummer, and if there be yet more moisture in it, you will perceive it in the head, but if you perceive it not in 6 or 8 days, then take the head off, and lay the polish'd Glass again upon the mouth of your Glass, increase the fire, that you can scarce endure your hand or finger in the Ashes an Ave-Mary while, continue the fire in that heat till the red Oil be all fixt with the Powder in the Glass, which you may know thus;
The use of enamel colours as enrichments to metal ornaments belongs to the later days of Rome. It was executed in what the French antiquaries term the champ-levé manner; that is, the part to be enamelled was cut, or hollowed, by a graving tool, in the surface, and then filled with fusible colours, rubbed when cool to a level surface.
These oily substances are no other than such as may be procured, in a similar manner, from the fusible or inflammable coal strata; we have therefore every proof of this mineral operation that the nature of things admit of.
The argument here employed is founded upon this fact; that, from the fusible species of coal, a caput mortuum may be formed by distillation, and that this chemical production has every essential quality, or every peculiar property, of the fixed and infusible species; although, from the circumstances of our operation, this caput mortuum may not have precisely the exterior appearance of the natural coal.
The rocks are of many kinds, white laminated, sometimes siliceous sandstone, purple and red sandstone, sometimes so highly calcareous as to have a crystalline fracture, argillaceous limestone, black calcareous slate-rock, like that so often described at Copiapo and other places, thinly laminated, fine-grained, greenish, indurated, sedimentary, fusible rocks, approaching in character to the so- called pseudo-honestone of Chile, including thin contemporaneous veins of gypsum, and lastly, much calcareous, laminated porcelain jasper, of a green colour, with red spots, and of extremely easy fusibility: I noticed one conformable stratum of a freckled-brown, feldspathic lava.
I understand now. The boss is made of a fusible alloy that melts at a certain prearranged temperature; it is simply a variation of the common safety plug used in all the systems of mechanical protection against fire. At noon to-morrow, March 21st, the rays of the sun will be concentrated by the lens in the window-sash and will fall upon this boss of fusible metal.
B. Thurium is a metal. C. Therefore thurium is fusible. Such a series of statements is called a syllogism. The major premise always states a general law; the minor premise shows that the general law applies to the particular case under consideration; and the conclusion is, in the light of the two premises, an established truth.
But an actual enamel painting on the principle of a picture, was rendered in still another way. In preparing the ground for enamel painting, there are two things which have been essentially considered in all times and countries. The enamel ground must be more fusible than the metal on which it is placed, or else both would melt together.
These strata alternate with a bluish, compact, fusible, feldspathic rock. Much of the above granular mixture has, also, a pseudo-brecciated structure, in which fragments are obscurely arranged in planes parallel to those of the stratification, and are conspicuous on the weathered surfaces.
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