| RefNo | AP/54/4/4 |
| Level | Item |
| Title | Unpublished figure, 'Electro-dynamometer' by W J [William James] Welch |
| Creator | Welch; William James |
| Date | [1872] |
| Description | An engraving showing an electrodynamometer (or wattmeter) resting on a wooden block atop bricks. The figure appears at the front of the paper and is eproduced on page 17a, labelled as figure 3.
Subject: Physics / Electricity / Scientific apparatus and instruments |
| Extent | 2p |
| Format | Drawing |
| PhysicalDescription | Ink and graphite pencil on paper |
| AccessStatus | Open |