Builder's hardware; a manual for architects, builders and house furnishers . cut on the back of theshell, as shown by thefigure. This eccentricgroove is so located withreference to the centre ofrotation of the cylinderthat when the plug isturned, the longer armof the fence is forced toone side, the amount ofeccentricity being suffi-cient to firmly wedge andhold the plug, in case thefence should not be freeto move laterally. Whenthe key is inserted, ashoulder on it first pressesback a pin, U, whichworks in a slot so as tohold the plug and theshell together and pre-vent accidental c
Builder's hardware; a manual for architects, builders and house furnishers . cut on the back of theshell, as shown by thefigure. This eccentricgroove is so located withreference to the centre ofrotation of the cylinderthat when the plug isturned, the longer armof the fence is forced toone side, the amount ofeccentricity being suffi-cient to firmly wedge andhold the plug, in case thefence should not be freeto move laterally. Whenthe key is inserted, ashoulder on it first pressesback a pin, U, whichworks in a slot so as tohold the plug and theshell together and pre-vent accidental cuts on the end ofthe key then force backthe slides in such ratiothat all the deep notchesare brought exactly ona line with the planeof the fence. The key is then turned, rotating the plug, bring-ing the fence to bear against the walls of the eccentric groove,and forcing it down into the notches of the slides, these notchesbeing of sufficient depth to allow the fence to entirely follow inthe eccentric groove. The arm, G, can thus operate on thelockinodever. 221 Chapter Fig. 341 , Cylinder Tront-Door Dickinson Mfg. Co. Hopkins 222 BUILDERS HARDWARE. Hopkins & DickinsonFront-DoorCylinder Lock. Chapter XI. The shallow notches on the slides are intended as a safe- guard against picking. By turning the plug with a knife blade,the fence can be brought to bear against the slides. Slight in-equalities in the width of the slides cannot be avoided, and thewidest slide will bind most firmly against the fence, so that bydepressing the slides successively with a fine pick one might intime be able to catch all the notches over the fence, and soundo the lock, were it not for the false notches which areso confusing that it is extremely difficult, and for most persons,impossible to pick the lock. Figure 341 illustrates an adaptation of this escutcheon to afront-door lock. The works are ingeniously arranged so thatthe key will operate both the dead-bolt and the latch, whileat the same
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