However, some manufacturers have recently made the decision to no longer include propylene glycol in their products. Do not be alarmed by the term antifreeze or by the chemical, propylene glycol. It is safe at the low concentrations when used in personal care products. This is possibly due to misinformation and propaganda circulated on the Internet in the interest of marketing natural products.
In 1927, the first iron lung was installed at Bellevue hospital in New York City. The first patients of the iron lung were polio patients with paralysis of the breathing muscles. Later John Emerson simplified Philip Drinkerâs invention and reduced the manufacturing costs. An iron lung has âport holesâ along both sides that allow access to the patient for medical needs and personal care. When an arm is inserted through these âport holesâ a rubber gasket provides an air tight seal. The bed of the iron lung can also slide forward to allow complete access to the patient. An iron lung, or tank respirator, is a very gentle means of providing breathing assistance. Because of its bulk the iron lung has been largely replaced with units that are smaller and portable.
On 16 February 1858 W. Vandenburg and J. Harvey patented an ironing table that facilitated pressing sleeves and pant legs. A truly portable folding ironing board was first patented in Canada in 1875 by John B. Porter. The invention also included a removable press board used for sleeves.