The SN4 type tram – the door (recorded from the outside)
The sound of doors opening and closing in an SN4 tram car. The sound was recorded outside the car. The SN4 motor…
Adjusting the Trip hammer with a sledge hammer
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About the sound
Adjusting the Trip hammer with a sledge hammer
A Trip hammer is made by cast iron and timber. All assemblies between iron and wood are made with wooden wedges. Before you start the hammer you have to check the wedges with a sledge hammer to find out if there are any loose ones.
The Lancashire forge in Olofsfors Iron Works, Västerbotten, is from 1870s. The Lancashire hearth was used to fine pig iron, removing carbon to produce wrought iron.
Sound recordist: Torsten Nilsson
Photographer: Torsten Nilsson
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