a sliding sleeve carrying thorough calcination for its production. through the flexible tube to the listener. Just beyond a sliding block, spring and screw-threaded plug, the Another improved cement of Forell is made as fol- the ear tube connection, in the top of the main tube, latter serving to… … CAMERON'S WATCHMAKER'S CALIPEBS. distant end of the tube. By means of a switch plate, • < » ■ ♦ An Eight mile Submarine Tunnel. shown in another view, the operator may be placed in out changing the position of the block. A lever The shore and submarine borings between Capes communication with any…
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