| Reference number | NLB/41/564 |
| Alternative reference number | NLB/41 p346 |
| Level | Item |
| Title | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons |
| Date | 14 January 1910 |
| Description | Instructs them to prepare an electro of the block illustrating Dr Augustus Desire Waller's paper on 'The Electromotive Changes connected with the Beat of the Mammalian Heart' for use in his book of lectures. |
| Extent | 1p |
| Format | Carbon |
| Physical description | Manuscript, very faded |
| Access status | Open |