Dr. knight’s Magnetic al Machine. 599 
the middle of the under part of the plank dd, on which 
the magnetic apparatus refts. The ifandards g are fixed 
to the fquare frame hh, and the whole fupported on the 
four trucks 11, whereby the two magazines are eafily 
brought end to end, or fet at a convenient diftance, fo as 
to admit a bar k, to be placed between the ends, to be 
made magnetical. 
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XL1II. A 
