U.S. Mail by pneumatic tube
A 1904 American trade catalogue of pneumatic tube systems, published by an unidentified publisher and likely aimed at businesses and postal authorities buying cash carriers and mail tube apparatus. The photographs show installed Lamson cash carriers, curved tube runs, and a tube station in offices and a post office, giving designers a record of early industrial plumbing-like machinery with dense parallel curves, metal fittings, and rows of brass-ended cylinders.
