Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . The vertical pressure usually expressedin |iounds. b. Tlie up-stream end of a canal-lock. 9. (Architecture.) The capital (caput, head) of acolumn. 10. The cover of an alembic or still. 11. (Fortif cation.) The salient or advanced por-tion of a work. A work covering the end of a bridge. 12. (Coopering.) That whicli closes the end of acask. 13. The obverse of a co
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . The vertical pressure usually expressedin |iounds. b. Tlie up-stream end of a canal-lock. 9. (Architecture.) The capital (caput, head) of acolumn. 10. The cover of an alembic or still. 11. (Fortif cation.) The salient or advanced por-tion of a work. A work covering the end of a bridge. 12. (Coopering.) That whicli closes the end of acask. 13. The obverse of a coin or medal. The oppositeside is the reverse, or t(til. 14. Tlie Clip of a windmill. Head-band. {Boiikbiudiny.) A strip of over a mill-board core, or a ]irojecting fillet offabric which serves as a finish to the top and bot-tom of the sheets inside the back. It is only usedin binding of superior character, as may be seen bycomparing a tine calf binding with one in ordinarycloth. Head-bay. (Hydraulic Engineering.) Thatpart of a caual-lock between the upper pond andthe head-gates of the lock. See Canal-lock. Head-block. 1. (Sair-mill.) a. The block onwhich the head — or forward end — of a log rests in Fig. of Hmd-Blnrk far Sau--M:ils. the ordinary saw-mill; the other end is the tail-block,and they are parts of the cariiage on whicli the log ismoved to the saw and gigged back. b. One of the pieces fonning the log-bed in a cir-cular or veneer .saw mill. (See CiiicuLAi: Saw.) Inthe example the sliding knees d form abutments forthe log which rests on the head-blocks /.. and are HEADER. 1U85 H E AD 1N G-M ACHINE. moved by screws in the luail-lilocks. On the ends iof the screws are the wlieels ii, wliieh are movedsinmltaneously by the lever <j, roil m, and racks s v. 2. {Jrhirhs.) A |tieet; ol wooil attached below tothe upper ring of the tiftli wheel and above to thefront sprinf^, also liavin^^ the front end of the perclimortised through its middle. Header. \
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