Early in the 20th Century, a basic tool for engineers and others using steam engines to power machinery in manufacturing plants was the “Steam Engine Indicator.” There were several varieties, but those made by the Crosby Steam Gage and Valve Co. in Boston are the ones that are ususally found today. The complete indicator set varied according to usage, and are almost always found missing parts, and in poor condition. The instruction book for these tools is usually missing, as well. This is one of those seldom seen book, This example was published by the Crosby Co in 1905. It is in three parts (General Instructions and Use; Additional Uses of the Indicator; and Properties of Steam and Perfect Gases). The book was written by Edward Miller and Albert Hall. It contains 175 pages with many illustrations and a fold out diagram. It is hard bound with a dark blue cover having gold lettering. The book measures 7 ¼ x 4 3/8”. It retains its original light brown paper dust cover that shows a little staining an wear. The binding, however, is tight and clean, and all of the pages are clean, without damage, and complete. It is a scarce book and in Fine, collectible condition
