Steam engine indicator, made by Isaac Storey & Sons Ltd., Manchester between 1862 and 1910. The box contains a graph showing the use of the indicator. The graph is on headed paper from John Musgrave and Sons of Globe Ironworks, Bolton.

This steam engine indicator was made by Manchester manufacturer Isaac Storey & Sons. It would have been used to check that steam engines were working correctly. The indicator would be fitted to a steam engine and paper would be secured around the drum. The drum would rotate and the indicator would draw a graph to show whether the engine was working properly. This indicator's box contains an example of a graph on headed paper from John Musgrave and Sons of Globe Ironworks, Bolton. This suggests it may have been repaired, serviced or used there.