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Dedication to John James Audubon in Descriptions of the Rapacious Birds of Great Britain, 1836
An image of the dedication in book by William MacGillivray
Deer trap. A long chunky piece of wood with a section hollowed out along the middle. In the hollow are pieces of wood, most prominently a curved pole with a hinge in the centre which runs the length of the hollow and is fastened down at either end by wooden pegs perpendicular to it.
Single valve 'otter trap' type, made from an alder trunk with trap of birch and the spring of willow. Found in a bog at Auquharney Moss, Cruden, Aberdeenshire. A radio-carbon date of the 6th century AD has been obtained for the trap (OxA-6052:…
Dental key. A steel tool with a bone handle. A crooked rod of steel projects from the handle. Two hinged curved arms with toothed tips and a fastener are on the end.
Dental key, later 19th century, used to extract teeth. Made of iron with an ivory handle. It has four hooks or heads each fitted on to the key by a screwed sleeve, and each is designed to fit around a different size and type of tooth.
Diagonal machine. A small square wooden frame, about a foot wide. A slightly smaller frame slides horizontally out. A brass ball on a string and attached to a pulley on the smaller frame moves diagonally upwards as the frame is slid horizontally.
Demonstration originated by James Ferguson to illustrate that the sum of compound motions at right angles produce a diagonal displacement. Wooden frame sliding element holding with brass ball on rod that slides up rod as frame is moved sideways. Disk…