The third and intermediate kind of instruction, which connects the first two... relates to the application of scientific principles to practical purposes. It qualifies the student to plan a structure or a machine for a given purpose, without the necessity of copying some existing example, and to adapt his designs to situations to which no existing example affords a parallel. It enables him to compute the theoretical limit of the strength or stability of a structure, or the efficiency of a machine of a particular kind-to ascertain how far an actual structure or machine fails to attain that limit-to discover the cause of such shortcomings-and to devise improvements for obviating such causes; and it enables him to judge how far an established practical rule is founded on reason, how far on mere custom, and how far on error. (William John Macquorn Rankine)

The third and intermediate kind of instruction, which connects the first two... relates to the application of scientific principles to practical purposes. It qualifies the student to plan a structure or a machine for a given purpose, without the necessity of copying some existing example, and to adapt his designs to situations to which no existing example affords a parallel. It enables him to compute the theoretical limit of the strength or stability of a structure, or the efficiency of a machine of a particular kind-to ascertain how far an actual structure or machine fails to attain that limit-to discover the cause of such shortcomings-and to devise improvements for obviating such causes; and it enables him to judge how far an established practical rule is founded on reason, how far on mere custom, and how far on error.

William John Macquorn Rankine

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actual application attain cause compute copying custom devise efficiency error example far given instruction intermediate judge kind limit machine mere necessity parallel particular plan practical purpose reason rule stability strength structure student third

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