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SeeFig . I, whereinA . is a smallsight with a short arm B. which may be turn’d round about, and mov’d up and down the small Cylinder CD, which is screw d into the pieceED . atD . this pieceE D moving round about the CenterE ; by which means the Sight may be remov’d either towardsR orF .

The description of an instrument invented divers years ago by Dr Christopher Wren, for drawing the out-lines of any object in perspective