Made up of 4 elements, three of which are the same, each 3.12 m long and a 2.23 m long top - built with first choice fir wood uprights and robinia steps of the same quality with single tenon joints and beveled along the entire length - equipped with 10/10 mm sheet iron bushes 50 cm long - upright section 90x40 mm and steps 35x23 mm - brass bushings on the 2 mm connection steps - drawn steel tie rods - articulated feet with interchangeable wooden soles - painting of all wooden parts with three layers of boat-type paint - gold-coloured galvanization of the compasses - built in compliance with the ministerial technical specifications.