Wooden platform and slide (?)
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Instrument has two parts- a platform and a slide. The platform is made of wood with brass rails running the length of it. At one end is a wood block that holds the instrument at an angle. The other end has an indentation the width of the instrument. In the middle of the instrument is a metal plate with grooves running down it's width. The slide is also made of wood and is a rectangle with two handles on the ends. On the bottom of the rectangle is a metal plate with grooves running down it's width. On either side of this plate are brass angles screwed into the wood rectangle. The angles have two ...