. India rubber world. inge, which has a rubber tube that fitstightly in the point section, is inserted in it. Then pen and tubeare placed in the water, and the bulb is pressed, forcing air intothe pen. If any bubbles are seen to rise in the water it is evidentthat the pen leaks and must be repaired or discarded. STAMPING THE NAME ON THE far as the manufacturing operations are concerned, theholder itself is complete, with the exception of having the namestamped on it. This is accomplished in the device shown i:iFigure 6. The barrel is placed on an arbor, on vv-hich it isclamped, thi
. India rubber world. inge, which has a rubber tube that fitstightly in the point section, is inserted in it. Then pen and tubeare placed in the water, and the bulb is pressed, forcing air intothe pen. If any bubbles are seen to rise in the water it is evidentthat the pen leaks and must be repaired or discarded. STAMPING THE NAME ON THE far as the manufacturing operations are concerned, theholder itself is complete, with the exception of having the namestamped on it. This is accomplished in the device shown i:iFigure 6. The barrel is placed on an arbor, on vv-hich it isclamped, this arbor being connected to a square slide B workingagainst the tension of a spiral spring. The barrel rests betweentwo rolls C and D, the latter roll having the stamp cut in relief,which is to be reproduced on the barrel. The handle E for operat- July 1, 1914.] THE INDIA RUBBER WORLD 535 ing the rolls is placed in the roll D, the latter being connected tothe roll C by a block chain. The groove in the roll C is lapered. Fig, 6. Rolling the X.\me in the Rlhber Harrel. slightly to corrcspnnd witli tliat on thi- barrel, and fits illustration shows a barrel just after the stamping opera-linn. The rolls are held on sliding bases, F and G, which canlie adjusted back and forth by the thumb-screws II and I, sothat pen barrels of various diameters can have the name rolledon them in this same fixture. CHASING THE n.\RREI. AND chasing is an exceedingly interesting process. It is doneby a special machine, which is shown in Figure 7, but it is rathera complicated and involved process and could hardly be explainedwithout going into too much detail for a general description likethis. In the machine shown in tlie illustration there arc six I)ar-rels being chased simultaneously. One feature of the machinethat is worthy of particular attention is the fact that this chasingcannot be done by steel cutters, as they do not retain their edsesifficiently long. A steel tool will work
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