. Railway mechanical engineer . contact f on 478 MECHANICAL EXGIXELR Vol. 92. No. 8 the niovalilc arm .1/, which at the low pressure jjoint restsagainst the stoj) P. When this contact is made, the circuit iscompleted throutjh the relay coil A, causing the ahnature .1to close. Attached to this is the contact CO which uponclosing completes the control circuit to the self-starter, caus-ing the motor to start. The armature is also attached to the s|iring .S whicii holdsthe contact C firmly C until contact is broken at /.As the jjressure , the needle pointer moves to the
. Railway mechanical engineer . contact f on 478 MECHANICAL EXGIXELR Vol. 92. No. 8 the niovalilc arm .1/, which at the low pressure jjoint restsagainst the stoj) P. When this contact is made, the circuit iscompleted throutjh the relay coil A, causing the ahnature .1to close. Attached to this is the contact CO which uponclosing completes the control circuit to the self-starter, caus-ing the motor to start. The armature is also attached to the s|iring .S whicii holdsthe contact C firmly C until contact is broken at /.As the jjressure , the needle pointer moves to theriglit, hut its lower part, to which the contact C is attached,moves to the left and is followed iiy the movable arm .1/.When the high ])ressure point is reached, the movalile arm isprevented from traveling further by stop / and the needlecontinues its course, i)reaking the circuit i)y separating con-tacts C and C. The inst;i!nt the circuit is broken, tht? relay Ris de-energzed, its armature falls, releasing the tension of the. Fig. 2—Pressure Governor Complete spring S, and because the movable arm .1/ is counterweighted,it returns to the stop post P. \Vhen the pressure is decreased to the minimum value, thecontact C again completes the relay coil circuit b}- engagingcontact C and the cycle of operation is repeated. The case is tapped and drilled at the bottom for the pres-sure pipe and electrical conduit connections. NEWTON RAIL DRILLING MACHINE A new design of multiple spindle rail drilling machinehas been brought out by the Newton Machine Tool Works,Inc., Twenty-third and Vine streets, Philadelphia, Pa. Thismachine is intended to be used in the rapid and simultane-ous drilling of the three or four holes recjuired in the endsof girder and other rails. Referring to the illustration, the three spindles shownoperate separately and are readily removed from the crossrail when desired. The spindle speed for the heavy drill-ing of main holes is 125 The work table is fittedw
Size: 1653px × 1511px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
