The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[621]. Venetian blind, but without revolving motion to the laths or slats.

[622]. Perforated bar and hooked rod suspender.

[623]. Lazy tongs expanding connecting rod.

[624]. Four-guide expanding link device, for varying motion.

[625]. Thorburn’s tube expander, operated by a central cone and ring of conical rollers.

[626]. Gasometer.

[627]. Timms’ expanding boring tool. Operated by a central cone and three or more diagonal feathers, sliding in dovetail grooves in the central cone.

Expanding Mandrel, [No. 507].

Expanding Chucks, [Nos. 489], [491], & [506].