Hartford Steam Boiler Inspection and Insurance Company · Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co · leaf 348
ility ofunequal heating andfire. A practical testfor moisture in com-mutators was obtainedby holding eyeglassesnear the open boltholes. If the glassesclouded, it was a clearindication that mois-ture was being drivenoff. After a commuta-tor was dry, as indi-cated by an insulationresistance test,… … TIM£ -OAVS TIE
Locomotives · Steam-boiler explosions
Internet Archive · Carnegie Library of Pittsburgh · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-192-67.webp)
