B.S. Top Bars
British Standard SMITH Frame Top bars
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Tolerances are + 0.1 mm
Material... Most softwoods are suitable.
Similar to National, these short lugged frames have a 19 mm lug length that is more in keeping with the standards throughout the rest of the world. (The 38 mm lug on National frames only came about due to cast metal spacers that were popular at the time.)
The upper item is the alternative type that is commonly used, the lower is the original 'standard' type that is recommended for brood chamber use.
Written... Summer 2000, Revised... 20 August 2002, Drawing Revised... 28 June 2006,