The instrument consists of two movable arms, each with a hole in the centre to allow the screw to slide inside. Each arm terminating with a steel point. On one of the arms are two non-linear scales, the first Division. Planoru. 1-100, the other Division. Solidoru. 1-100. On the reverse side there are two other engraved non-linear scales Divisiones linee 1-10 and Divisiones circuli 4-20). Graduated on the sides :"diameter ½ Circumferentie with geometrical symbols. Further lettered graduations O/C, C/D, P/I, G/C/I and P/C to side. Each arm is pierced with two holes in which a needle gnomon composed of a steel rod and a spherical brass head can be set. The inside with later added spurisous signtaure 'Michael Coignet fecit'. In, closing, contemporary embossed leather case with red lined interior.
10 x 2¹⁄₂ x 1¹⁄₂in. (26 x 6 x 4cm.) in case

Specified lots are being stored at Crozier Park Royal (details below) or will be removed from Christie’s, 8 King Street, London, SW1Y 6QT by 5.00pm on the day of the sale. Christie’s will inform you if the lot has been sent offsite. If the lot has been transferred to Crozier Park Royal, it will be available for collection from 12.00pm on the second business day following the sale. Please call Christie’s Client Service 24 hours in advance to book a collection time at Crozier Park Royal. All collections from Crozier Park Royal will be by pre-booked appointment only. Tel: +44 (0)20 7839 9060 Email: cscollectionsuk@christies.com. If the lot remains at Christie’s, 8 King Street, it will be available for collection on any working day (not weekends) from 9.00am to 5.00pm
This lot has been imported from outside of the UK for sale and placed under the Temporary Admission regime. Import VAT is payable at 5% on the hammer price. VAT at 20% will be added to the buyer’s premium but will not be shown separately on our invoice.
Please note this lot is the property of a consumer. See H1 of the Conditions of Sale.