double speed pulley

A contrivance for giving what is termed double speed to the spindles of the self-acting mule. double-square, s. Needlework : An embroidery stitch, also known as Queen stitch. double-standard, s . In economics the phrase Double Standard is used to signify a "Double Standard of Monetary Value." It implies the exist ence of what is known as the Gold Standard on the one hand, and the Silver Standard on the other. Wherever the Double Standard in its integrity is in use a creditor is bound to accept payment of any sum in coins of either of the metals, gold or silver, which the debtor may choose to tender. ( Bithell .) double-stars, s. pl. Astron.: Two stars so close to each other as to appear one to the naked eye.