Table: Surfaces | Abbreviations used
| Msp: | Polished brass |
| Msa: | Antique brass, matt finish |
| Mss: | Brass with black powder coating |
| MsNi: | Nickel-plated brass, shiny surface |
| MsNim: | Brass matt nickel-plated, brushed surface |
| Fe: | Eisen's raw |
| Feg: | wrought iron |
| FeZn: | Hot-dip galvanised iron |
| FeZis: | Black galvanised iron (see footnote on room doors) |
| Tg: | Raw malleable cast iron |










