An R.W. Ash Brass Right-angle Gauge; image credit on full record.
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Gauge; Ash (RW), Right Angle, Brass, 12 inch.
R.W. Ash Brass Right-angle Gauge, 19th century, 12-in. instrument with arch calibrated 0-90 in both directions with 1-degree increments, and hinged ce... [more detail available via subscription]