Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 488
To alter the tension on the recoil spring of this reducingmotion, remove the nut E, and grasping the milled headC between the thumb and forefinger, pull it from the casefar enough to allow it to be turned. Then twist it to theright, if more tension is desired, and allow it to slide ontothe square…