©iStockphoto.com/Bruce Lonngren
©iStockphoto.com/Bruce Lonngren
These are the smaller versions of blackboards, used with chalk, before cheap paper.
| Designation | Size in inches |
|---|---|
| Princess | 24 × 14 |
| Duchess | 24 × 12 |
| Marchioness | 22 × 12 |
| Countess | 20 × 10 |
| Viscountess | 18 × 10 |
| 18 × 9 | |
| Ladies | 18 × 10 |
| 16 × 8 | |
| 15 × 8 | |
| 14 × 12 | |
| 14 × 8 | |
| Plantation | 13 × 11 |
| Double | 13 × 18 |
| 12 × 20 |
Frederick Danvers Power.
A Pocket-Book for Miners and Metallurgists, comprising Rules,
Formulae, Tables and Notes for Use in Field and Office Work.
London: Crosby, Lockwood and Son, 1892.
Page 43.
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Last revised: day month 2010.