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Scientific American, Vol. 68, No. 1 (January 1893) (1893)

leaf 4

An illustration from Scientific American, Vol. 68, No. 1 (January 1893), 1893, leaf 4
$tintitit ^mtxiau. January 7, 1893,] … These machines have service, both upon sea BOUGHTONS " TELEPHOTOS," FOR DAY AND NIGHT SIGNALING. an improved form of and land, and adapted tool block, very solid for day or night use. and rigid. The cutting blades are set at an angle The by means of a thumb screw and ratchet, whereby improvement is…

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