Framed Prints
Framed Print of Electro-ballistic apparatus for measuring the speed of cannon-shot, 1864. Creator: Unknown
Electro-ballistic apparatus for measuring the speed of cannon-shot, 1864. Apparatus invented by Major Navez, of the Belgian Artillery. Upon the gun being fired, the projectile cuts the wires of the first screen, and thus demagnetises the electro-magnet which holds up the pendulum. This latter commences to fall, and the index-needle with it along the graduated arc. When the second screen is cut through by the shot, the electro-magnet at the top of the conjunctor is demagnetised, and the weight falls into the mercury pressing down the steel blade, and completes another electric circuit, which magnetises the large magnet in rear of the pendulum, and clamps the index-needle against the scale on the arc. The operator then reads off the scale the distance which is marked by the index, and the time thus measured is that which the shot took to pass through the screens, minus the time necessary for the weight to fall in the conjunctor, and which the operator, before commencing, finds by means of the disjunctor...a skilful operator is able to measure...to the three-thousandth part of a second. Such wonderful precision renders this instrument most valuable for artillery scientific purposes'. From Illustrated London News, 1864. Heritage Images features heritage image collections. © The Print Collector/Heritage Images
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Media ID 38074599
Accuracy Apparatus Ballistics Contraption Equipment Instrument Invention Magnetism Measurement Measurements Measuring Projectile Scale Scale Drawing Speed Tophat
Modern Frame 14"x12" (36x31cm)
Ready to Hang Contemporary Framed Prints adds style, protection, and a polished touch to your space - effortlessly.
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Wood effect frame, card mounted, 10x8 fade resistant photo print. Overall outside dimensions 14x12 inches (36x31cm). Environmentally and ozone friendly, 40mm wide x 15mm Polycore® moulding has the look of real wood, is durable and light and easy to hang. Biodegradable and made with non-chlorinated gases (no toxic fumes) it is efficient; producing 100 tons of polystyrene can save 300 tons of trees! Prints are glazed with lightweight, shatterproof, optical clarity acrylic (providing the same general protection from the environment as glass). The back is stapled hardboard with a sawtooth hanger attached. Note: measurements provided are estimated outer dimensions, which include both the image and the frame. While we aim to keep sizing consistent, exact dimensions may vary slightly due to differences in print size or production requirements, which may result in a variation in the overall size (up to approximately 2.5cm (1"))
These are individually made so all sizes are approximate
Estimated Image Size (if not cropped) is 24.4cm x 15.3cm (9.6" x 6")
Estimated Product Size is 36cm x 31cm (14.2" x 12.2")
