Chapter CXLVI: Section 80: Springs

(_See also p. 178._)

=2479. Wooden springs= of lance wood or ash.

=2480. Carriage spring,= with splayed link suspension. This improves the play and action of the spring over the vertical method.

=2481. Duplex compression spring.= The two springs are coiled opposite ways.

=2482. Equalising lever= to distribute the load on two car springs.

=2483. Double-ended volute spring= for compression.

=2484. Spring band.=

=Spring piston rings.= See Section 58.

=2485. Conoidal spiral spring.=

=2486. Adjustable spiral spring.= A washer on top has four vanes below it drilled with holes to suit the diameter and pitch of the spring wire, which, being threaded through the vanes, is rendered inactive, so far as it is held by the vanes. This appliance, therefore, is used to shorten or lengthen the live or active part of a spiral spring.