An account of an horizontal Top, invented by Mr Serson / James Short. 1752 Feb 6. 3p. on 3 leaves. [Ms. transcription from Philosophical Transactions/Royal Society v.47, p.352 of Short's paper. It refers to Science Museum object (inv.no.1927-1123), an artificial horizon or whirling speculum. (The account mentions Mr [John] Smeaton and [Sir] William Watson.) The leaves include a further 2p. of notes on the speculum and on Sir Isaac Newton's First Law of Motion.]