Counter balance arm

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Counter balance arm from Airy's water clock for driving the Great Equatorial.

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ID:	ZAA0530.7
Type:	Counter balance arm
Display location:	Not on display
Creator:	Ransomes & Sims
Date made:	circa 1860
People:	Airy, George Biddell
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 53 mm x 242 mm x 95 mm; Weight: .05 kg
Parts:	Sidereal drive Governor and main driving wheel (ZAA0530.1) Main casting (ZAA0530.2) Drive mounting (ZAA0530.3) Impeller and housing (ZAA0530.4) Segmental weight (ZAA0530.5) Valve (ZAA0530.6) Counter balance arm (ZAA0530.7) Lead funnel (ZAA0530.8) Conical flange (ZAA0530.9) Bolt with nut attached (ZAA0530.10) Mounting (ZAA0530.11) Bolt (ZAA0530.12) Bolt (ZAA0530.13) Bolt (ZAA0530.14) Bolt (ZAA0530.15) Bolt (ZAA0530.16) Bolt (ZAA0530.17) Bolt (ZAA0530.18) Bolt (ZAA0530.19) Bolt (ZAA0530.20) Bolt (ZAA0530.21) Square nut (ZAA0530.22) Square nut (ZAA0530.23) Metal pipe (ZAA0530.24) Metal pipe (ZAA0530.25) Nut (ZAA0530.26) Metal component (ZAA0530.27) Metal component (ZAA0530.28) Metal bar (ZAA0530.29) Bolt (ZAA0530.30) Metal pipe (ZAA0530.31) Washer (ZAA0530.32) Washer (ZAA0530.33) Washer (ZAA0530.34) Lead weight (ZAA0530.35) Lead weight (ZAA0530.36) Rod (ZAA0530.37) Balancing object (ZAA0530.38) Cylinder (ZAA0530.39) Connecting pipe (ZAA0530.40) Connecting pipe (ZAA0530.41) Connecting pipe (ZAA0530.42) Connecting pipe (ZAA0530.43) Connecting pipe (ZAA0530.44)