Ferrum armatumformula calculi ponderis

Formula: diameter mm × diameter mm × 0.00617 × longitudo m

Exemplum: Ferrum armatum Φ20mm (diametro) × 12m (longitudine)

Computatio: 20 × 20 × 0.00617 × 12 = 29.616 kg

 

Tubus Ferreusformula ponderis

Formula: (diameter exterior - crassitudo parietis) × crassitudo parietis mm × 0.02466 × longitudo m

Exemplum: tubus ferreus 114mm (diametro exteriore) × 4mm (crassitudo parietis) × 6m (longitudo)

Computatio: (114-4) × 4 × 0.02466 × 6 = 65.102 kg

 

Chalybs planusformula ponderis

Formula: latitudo lateris (mm) × crassitudo (mm) × longitudo (m) × 0.00785

Exemplum: chalybs planus 50mm (latitudo lateris) × 5.0mm (crassitudo) × 6m (longitudo)

Computatio: 50 × 5 × 6 × 0.00785 = 11.7.75 (kg)

 

Lamina ferreaformula calculi ponderis

Formula: 7.85 × longitudo (m) × latitudo (m) × crassitudo (mm)

Exemplum: lamina ferrea 6m (longitudo) × 1.51m (latitudo) × 9.75mm (crassitudo)

Computatio: 7.85 × 6 × 1.51 × 9.75 = 693.43 kg

 

Aequalischalybis angularisformula ponderis

Formula: latitudo lateris mm × crassitudo × 0.015 × longitudo m (calculatio approximata)

Exemplum: Angulus 50mm × 50mm × 5 crassus × 6m (longus)

Computatio: 50 × 5 × 0.015 × 6 = 22.5 kg (tabula pro 22.62)

 

Chalybs anguli inaequalis formula ponderis

Formula: (latitudo lateris + latitudo lateris) × crassitudo × 0.0076 × longitudo m (calculatio approximata)

Exemplum: Angulus 100mm × 80mm × 8 crassus × 6m (longus)

Computatio: (100 + 80) × 8 × 0.0076 × 6 = 65.67 kg (Tabula 65.676)