Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . ^ Each draughting office seems at present tobe a law unto itself in this matter. 74. As affording valuable examples for further exercisewith the ruling pen the system of section - lines adopted bythe Pennsylvania Railroad is presented on the opposite wood section is an exception to the rule, being drawnfree-hand, with a Falcon \>en. T^s- -SiO. gy ^yr^y gf coutrasting free-hand with me- chanical work Fio;. 40 is introduced, in which.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering