Scottish National Dictionary (1700–)
THRAPPLE, n.2 Only in comb. thrap(p)le-plough, an obsolete type of single-stilted wooden plough used in Cai., sim. to the Orkney plough, having a ribbed mould-board. For a full description see J. Henderson .Agric. Cai. (1812) 56–7 and A. Fenton in P.S.A.S. XCVI. 292 sqq. Hist.
Cai. 1795 J. Sinclair Agric. N. Counties 204:
About a century ago, the only plough known or used in this country, was called the thrapple plough. Sc. 1831 J. Logan Scottish Gael II. 89:
The old Thraple plough is now seldom to be seen, except in the remote Highlands, or in the Orkneys. In Argyleshire, it continued to be used on some farms about twenty years ago. It was entirely composed of wood, with the exception of the culter and sock, and had but one stilt. Cai. 1875 Trans. Highl. Soc. 178:
The plough in use was called the “thrapple plough.”
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"Thrapple n.2". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 17 Mar 2018 <http://www.dsl.ac.uk/entry/snd/thrapple_n2>
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