Photograph of a man standing next to a field ditcher used in irrigation next to farm buildings in Colorado, USA in the early 20th century.

Letter from Patrick Wilson to Joseph Black about James Watt's copying machine and other matters.

Volume contains manuscript notes on general mechanics, and on pulleys and wedges in particular, and wheels and axles. There are subsidiary discussions of things like collision and the mechanics of muscular action. The astronomy notes promised on the book's spine describe how to manage the study of the heavens with big machines. Numerous small diagrams intersperse throughout the book. Some terms appear in Russian.

Illustration of a patented egg testing machine showing the eggs going through it on a conveyor belt with an area for defective eggs and a feeding tray.

Illustration of a plantation rubber washing machine.

Photograph of a corridor on a ship showing the range of some of the boilers and furnaces in the early 20th century.

The records consist of: ledgers F, H, and K, between 1811 and 1822; and, customers' journal 1892-1897, containing accounts for sales, repairs etc. of lathes, machinery and tools.

Photograph of men using a steam shovel to open up the main canal 10 miles from the headgate by digging up dirt and placing it in open train cars in the early 20th century.

Located in Poultry Research Centre Staff Papers 1974.

Located in Poultry Research Centre Staff Papers 1974.