Chapter CXXXIII: Section 57: Pipes and Conveyors

(_See also p. 128._)

=2338. Boiler tube,= internally ribbed. Serve’s patent.

=2339. Boiler tube flue,= corrugated, to add to its strength and heating surface. Fox’s patent.

=2340. Pipe joint,= with toggle clips.

=2341. Pipe flange,= with caulking groove.

=Flexible tubes,= metallic, are now manufactured by the Flexible
Metallic Tubing Co. in most metals, including steel, and in various
strengths and with various degrees of flexibility, from that of plain
rubber to such stiffness as requires a little force to bend it. These
tubes are perfectly air-tight, and will stand great pressures.

=Wire rope transmission; Telpher gear.= See Section 66.