The four-gap bridge has large and heave brass strip mounted on a heavy 3/4" thick laminated base of size 44”*5” complete with pencil jockey and lead for connection overall dimension: 1.10m*100mm*50mm high including terminals.
Rest specifications are same as above. Pencil jockey is replaced by superior quality spring type, Brass Sliding jockey, which moves on mental rod, fitted on a laminated board of size 44”*5”*3/4.”
One meter long, Sunmica covered plywood base with brass strip and thick terminal 2 or 4 gap with pencil type sliding jockey.
Same as above but with Aluminium sliding jockey (spring type) on rod.
With brass C.P. strip, spring type brass sliding jockey on rod and wire stretched over Sun mica surface (whole plywood surface is covered with Sunmica sheet).