. American engineer and railroad journal . s stoppedoff from the valve and the parts cool, the sectional brassspider contracts to a greater extent than the balance of thesurrounding metals, and releases the packing rings, leavingthem entirely free in their seats. When steam is admitted,the expansion of the spider being proportionately greater,the valves necessarily quickly assume their original ad-justment. It is the employment of the metals of varying expansi-bility that makes the positive valve adjustment practica- VoU LXVI, No. .).J ENGINEERING JOURNAL. 423 ble. The brass spider, having the
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. American engineer and railroad journal . s stoppedoff from the valve and the parts cool, the sectional brassspider contracts to a greater extent than the balance of thesurrounding metals, and releases the packing rings, leavingthem entirely free in their seats. When steam is admitted, the expansion of the spider being proportionately greater, the valves necessarily quickly assume their original ad-justment. It is the employment of the metals of varying expansi-bility that makes the positive valve adjustment practica- VoU LXVI, No. .).J ENGINEERING JOURNAL. 423 ble. The brass spider, having the greater range of ex-pansion, is so constructed as lo bo most susceptible to thech.mge of temperature. The gi-nera) construction is shown in the cut ; it willbe o!)5erved lliai the peripheral adjusinicMt lo coiiipensale Mr. Weilers lecture (delivered in 10 different cities ofBelgium during the past three months; is entitled, In-dustrial Conciliation and the Role of the Labor Leader.After explaining in the first part of the lecture what he. THE HARRISBURG IDEAL TANDEM COMPOUND ENGINE. for wear does not affect any other adjustments for steamdistribution. The advantages claimed for this form of valve are thatit is tight, balanced, and reduces the friction to a mini- the