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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…
Dibbler. A wooden bar about half a metre long with three fat pegs projecting from it. Projecting from the other side are two rods attached to a bar with handles.
Three drill dibbler. used for planting seed.
