Base No. 5 ([page 148]), is as follows:
| PbO | .6 |
| CaO | .3 |
| K2O | .1 |
| —— | |
| 1.0 |
And this made up into a bisilicate glaze would be:
| PbO | .6 | } | ||||
| CaO | .3 | } | Al2O3 | .2 | SiO2 | 1.6 |
| K2O | .1 | } | ||||
| —— | } | |||||
| 1.0 | } |
These items are extended in a horizontal line, a space being left on one side for the list of ingredients.
| PbO | CaO | K2O | Al2O3 | SiO2 | |||
| .6 | .3 | .1 | .2 | 1.6 | |||
| Addition | .6 | White Lead | .6 | ||||
| Subtraction | .0 | .3 | .1 | .2 | 1.6 | ||
| Addition | .3 | Whiting | .3 | ||||
| Subtraction | .0 | .1 | .2 | 1.6 | |||
| Addition | .1 | .1 | .6 | Feldspar | .1 | ||
| Subtraction | .0 | .1 | 1.0 | ||||
| Addition | .1 | .2 | Kaolin | .1 | |||
| Subtraction | .0 | .8 | |||||
| Addition | .8 | Flint | .8 | ||||
| Subtraction | .0 |
Each item is thus disposed of until the list is complete. These figures are, however, given in equivalents and each must be multiplied by the equivalent weight of the substance used.
| White Lead | .6 × 258 = | 154.8 | parts by weight |
| Whiting (calcium carbonate) | .3 × 100 = | 30.0 | " " " |
| Feldspar | .1 × 557 = | 55.7 | " " " |
| Kaolin | .1 × 258 = | 25.8 | " " " |
| Flint | .8 × 60 = | 48.0 | " " " |
| —— | |||
| 314.3 | Batch of Glaze |