1851 Great Exhibition: Official Catalogue: Class X.: Thomas Simpson
From Graces Guide
532. SIMPSON, THOMAS, Sea-Lion Hotel, Hanley-in-the-Potteries — Inventor.
Norma virium, or musical accentuator, intended to supersede the metronome. It marks the first note in every bar, loud and distinct, in all measures of time; and gives in weaker beats the sectional divisions.
[The word "metronome" is devived from [excluded], measure; and [excluded], division. The instrument was invented by John Maelzel, in Austria, 1814. The more modern kinds of this instrument exhibit an improvement analagous to the principal feature of the Norma Virium, viz., a distinct separation of the first, from the following beats in a bar, which is effected by the striking of a small bell at the first beat.—H. E. D.]
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