Hartford Steam Boiler Inspection and Insurance Company · Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co · leaf 86
the means whereby earlydiscovery of caustic action has been made possible. Cracks so smallthat they are entirely invisible to the naked eye are magnified twenty-twotimes by the reflecting mirror and lens, and no matter how deep thehole the instrument permits a minute examination of every portion… … Figure 4The periscope in use by an inspector on the mud drum of a water tubeboiler. Muriatic acid and fine emery cloth arc used to polish the hole so that, tothe naked eye, its surface appears bright and smooth. Thus the campaign against caustic embrittlement, the insidiousagent that was once…
Locomotives · Steam-boiler explosions
Internet Archive · Carnegie Library of Pittsburgh · Public Domain Mark 1.0. Free to use for anything.
