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Abrasion
Cutting by chisell, by shears, by file, by borer
Hammering
The art of giving form by procuring a new arrangement of the particles of the metal by means of an hard body striking upon it
Goldbeater.
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Information &c.
The laws of percussion for the shape weight & velocity of the striking body or hammer.
for the part upon which the stroke is to be directed.
The effect of elastic or non-elastic supports to the metal during the stroke in facilitating or impeding the effect of the stroke upon the metal.
Aptitude in discerning form & dexterity in applying the stroke so as to remove particles of the metal in the most convenient mannerfrom the part where they are too abundantto a part where they are deficient
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<head>Attrition, Grinding & Polishing Forging
The art of giving temporary malleability to metals by a regulated degree of heatfor the purpose of working them & of giving them form during their most malleable state by means of an hard body striking upon them, partly procuring a new arrangement of their particles, & in part by displacingaltogether portions of the metal or heterogeneous substances.
Information &c.
Chemsitry & natural philosophy in so far as necessary for the management of the combustion of ordinary fuel so as to regulate the degree & quantity of heat produced by it.
Knowledge of the relative powers for conducting heat of the various metals, air in motion or at rest, deleted text of water,
Of the different degrees of malleability of metals at the different degrees of heat with respect to the necessity of accelerating the effects of the striking body at a certain time.
Of the means of retarding the cooling of the metal at work upon.
Of continuing the degree of heat
of the injury the metal may suffer by neglect.
Sufficient Chemical knowledge of the kinds of fuel usually employed, to distinguish such as are generally known to contain matters prejudicial to the metals.
Aptitude in judging of the degree of contraction likely to take place on cooling in the various parts of wrought metals according to their dimensions.
Knowledge of the change of properties in metals at the different degrees of heat.
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Identifier: | JB/107/123/002"JB/" can not be assigned to a declared number type with value 107. |
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107 |
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123 |
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002 |
the art of giving form to metals by casting, forging, hammering, stamping, boring, filing, chizzling, grinding, bending, soldering |
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rudiments sheet (brouillon) |
2 |
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recto |
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i taylor |
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evan nepean |
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35114 |
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