Model of the Bed of a 20-cm Sea Service Mortar on a Pivoting Undercarriage, Rijkswerf Amsterdam, 1855 Canvas Print
Model of a mortar chair for mortar of 20 inches (cm) on swivel bed. The swivel bed consists of a flat wooden plate with hole for the spindle bolt in the middle. On the back is a fixed bumper with five removable beams, which serve as a buffer for absorbing the recoil; between these beams are small bobbins, in turn at the ends or in the middle, which allows the beams to spring. The chair consists of two parts placed in a lag direction and has tap cushions entirely of brass, a trough for the mortar in lying position and a removable direction block, which gives the mortar an elevation of 45°. Scale 1:5 (scale on model).
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