Steel filings

It amazed me that Edgewood had allowed Klee to publish the results in the open literature. If he had conducted the same tests in our laboratory, the Security Office would have promptly stamped his reports Secref and locked them up in a steel file. Nevertheless, both the editor of the journal and the security gatekeepers at Edgewood approved Klee s publication, apparently without a blink. One might conclude that they treated hired contractors and in-house investigators as different breeds when it came to classifying their work. 

IRON AND STEEL FILINGS Give white and red sparks. 

Stars of the only two compositions which are well approved. Take of powder (gunpowder) four ounces, of saltpeter two ounces, of sulfur two ounces, of camphor half an ounce, of steel filings two treseaux, of white amber half an ounce, of antimony (sulfide) half an ounce, of (corrosive) sublimate half an ounce. For double the efficacy it is necessary to temper all these powders with gum agragante dissolved in brandy over hot cinders. When you see that the gum is well swollen and fully ready, to mix with the said brandy, it is necessary forthwith to mix them in a mortar with the powder, the quicker the better, and then to cut up the resulting paste into pieces. These stars are very beautiful and very flowery. Note that it is necessary to put them to dry in a pastry or baking oven after the bread has been taken off of the hearth. 

Brilliant fire meal powder 16 parts, steel filings 4 parts. 

Silver rain for a turning sun or fire wheel meal powder 16 parts, saltpeter 1, sulfur 1, steel filings 5 parts. 

The use of iron and steel filings in the compositions produces a more brilliant display of scintillating sparks. The following formulas are typical. Water is used for applying the composi-... 

It was discovered early in the sixteenth century that a combustible gas is formed when sulfuric acid acts upon steel filings or iron nails. Robert Boyle of Oxford observed that hydrogen would not burn in the rarefied atmosphere produced by his air pump. Henry Cavendish in 1781 showed that water is produced when hydrogen combines with oxygen. He did not,... 

Store of the only two cowtpoe ione which are well ajfh-proved. Take of powder (gunpowder) four ounces, of sslt-l>eter two ounces, of sulfur tw o ounces, of camphor half an ounce, of steel filings two treseatix, of white amber half an... 

The hardness of a mineral can be determined by a scratch test. The scratch test establishes how easily a mark can be made on a mineral sample using different materials. If a mark is made easily, the mineral is not very hard. If no mark can be made, then the mineral is quite hard. The hardness is then measured on a scale of 1-10, called Mohs hardness scale, named after the Austrian scientist F. Mohs, who developed this procedure. If a fingernail can scratch a particular mineral, it would have a hardness of 2.5. If a penny can scratch it, its hardness is around 3. If a mineral can be scratched by glass, its hardness is 5.5. If it can be scratched by unglazed porcelain, it has a hardness between 6 and 6.5, and if a steel file can leave a mark, it has a hardness of 6-7. Talc is the softest mineral with a hardness rating of 1, while diamond is the hardest, rated 10. 

The reddish sparks (s) are obtained from charcoal fire or steel filing fire. In Japan this light source is called Hiki , which means an amber stream. We have more lonely.red orange one, named "Yugen-biki , which means an amber stream of mystery. 

Charcoal. Steel filing. Cast iron fil-IngB. 

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