Hoisting Appliances

"Hoisting Appliances" by International Correspondence Schools is a technical manual from the early 1900s that goes into how different machines lift heavy things in industries like mining and building big structures. At first, the publication talks about hoist indicators, which are very important for showing exactly where cages or skips are inside deep vertical shafts. Different kinds of indicators are explained to the degree of their mechanics, such as the column and dial types, and why they are important for keeping things safe and correct. The writing is very specific and detailed, and it seems like the publication would be helpful for experts or students in engineering who want to deeply understand about machines that help lift materials.