a smooth workmanlike finish
Fig. 20.—Electric-arc welded steel box under 15 lb. hydrostatic pressure; one phase of the breathing test.
(cropped from page and border)
illustrating H. M. Hobart. "Welding Mild Steel." Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers 62 (1919) : 569-613 (discussion 613-664
University of Chicago copy, digitized October 17, 2012
From Appendix D. Arc-welded Steel Box.
charcoal drawing quality an artefact of the google "Claude Glass" effect
epigram from p 612
9 March 2014
tags: H. M. Hobart; Claude Glass; breathing test; steel; tests