Subjects:

“…Main results: New confined stainless steel Hartmann tube and falling hammer equipment help bring experiments to a higher degree of safety and efficiency. …”

“…— A soapy damp cloth is all that is needed in these days of chromium plated, stainless steel or composition fittings. The cleanest way of lighting the home is by electricity, but even electric light globes and bowls must be carefully dusted from time to time and wiped with a damp soapy rag so as to get full benefit of the light. …”