- 505110 : P30 Filament Block Assembly, Nichrome
Nichrome 3-coil (505115) or 4-coil (505116) filament: The P30N-series mounting assembly consists of two brass bus bars and posts for conducting electrical current through the filament, with brass thumbscrews to secure the filament to the conducting posts.
- 505111 : P30 Filament Block Assembly, Platinum/Iridium
Platinum/iridium trough shaped foil filament P30P. The P30P mounting assembly consists of two brass-clamping blocks and two Phillips-head screws that secure the filament between spring-loaded clamps.