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it into the cylinder of the rivetter, combined with the steadypressure or squeeze due to the load, was established.

One of Mr. Tweddell’s fixed hydraulic rivetters is shown byfigs. 20 to 27. A side elevation is given by fig. 20. An endelevation by fig. 21. Fig. 22 is a plan and fig. 23 a longitu-

Fig. 20. Fig. 21.

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Fig. 22.

dinal section. Fig. 24 is a back elevation, and fig. 25 is a frontelevation. Fig. 26 is a sectional plan of the valve box. Fig. 27 isa longitudinal section of the ram. These illustrations are takenfrom the Proceedings of the Institution of Mechanical Engineers.