. Railway mechanical engineer . e governor is mounted in the flywheel and operated bycentrifugal force and inertia. The governor arm is con-nected to the steam valve eccentric and by changing the throwof the latter it changes the point of the cut-off of the steamentering the cylinder. This method is obviously superior tothe old scheme of merely throttlng the steam. It is apparentthat variations in speed may be made by adding or remov-ing weisht?. Unlike the old counterflow engines, which were regulatedeconomically by slowing down during the unloaded periodsof the compressor, the Dual Flow is a
. Railway mechanical engineer . e governor is mounted in the flywheel and operated bycentrifugal force and inertia. The governor arm is con-nected to the steam valve eccentric and by changing the throwof the latter it changes the point of the cut-off of the steamentering the cylinder. This method is obviously superior tothe old scheme of merely throttlng the steam. It is apparentthat variations in speed may be made by adding or remov-ing weisht?. Unlike the old counterflow engines, which were regulatedeconomically by slowing down during the unloaded periodsof the compressor, the Dual Flow is a constant speed machineand shows the best steam economy when operating at itsgreatest speed. Regulation is therefore .effected by two-step capacity control. Two differential unloaders connect withthe inlet valves and reduce the capacity of the compressor intwo steps. One unloader holds open the inlet valves on thecrank end of one cylinder and the head end of the second unloader holds open the inlet valves at the oppo-. Fig. 3—Cross Section of Dual Flow Steam Cylinder site ends. This is one of the simplest, most positive andmost efficient methods of regulation known. The air valvesare of the Simplate, independent disc type. Staybolt Equipment for Flat Turret Lathes THE advantages of the staybolt equipment developed re-cently by the Acme Machine Tool Company, Cincin-nati, Ohio, for use on flat turret lathes are readilyapparent, the principal object of this equipment being toproduce accurate threads of the same concentricity and lead : J ibi-q| 4t Sh**^^™* ^SB s fc ^ S ^^Jmg ^V^^^B^HK 9 staybolt Thread Cutting Equipment for UseFlat Turret Lathes Cincinnati Acme on both ends of staybolts. It is essential to have both dieheads cutting simultaneously so that the leads will corre-spond exactly with that of the master stay bolt tap. Therear die-head is made adjustable, as shown in the illustra- tion, so that any length of bolt within the range of themachine can be handled
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
