This series is an index for all the drawings produced by the company from its foundation. Details of drawings are recorded chronologically within these volumes. For each drawing the following details are recorded; the date of entry into the index, the drawing number, a description of the drawing and the name of the draughtsman who prepared the drawing. If the drawing relates to an engine sometimes the engine number is recorded.
- Access is given in accordance with the Museum of Science and Industry's access policy. Material from this collection is available to researchers through the Museum's Archive Study Area.