Steel arm with a jewel

Steel arm with a jewel associated with ZAA0539 slave clock.

ID:	ZAA0539.18
Type:	Steel arm with a jewel
Display location:	Display - ROG
Creator:	Unknown
Date made:	circa 1924
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 36 x 7 x 3 mm
Parts:	Shortt Free Pendulum System, No. 3, Designed by William Hamilton Shortt and manufactured by the Synchronome Co. Ltd. 32-34 Clerkenwell Road, London (Shortt Free Pendulum System No 3) Slave clock (ZAA0539.1) Master impulsing unit (ZAA0539.2) Manometer (ZAA0539.3) Master suspension unit (ZAA0539.4) Master impulse arm and roller (ZAA0539.5) Slave suspension unit (ZAA0539.6) Small steel spring (ZAA0539.8) Small steel spring (ZAA0539.9) Six timing weights (ZAA0539.10) Bell jar (ZAA0539.11) Beat plaque (ZAA0539.12) Microscope (ZAA0539.13) Glass plate and spacer (ZAA0539.14) Name plate (ZAA0539.15) Timing weights (ZAA0539.16) Frame (ZAA0539.17) Steel arm with a jewel (ZAA0539.18) Pendulum (ZAA0539.19) Pendulum (ZAA0539.20) Master Tank (ZAA0539.21) Case key (ZAA0539.22)