Shamrock has two tabernacles, a main and a mizzen, into which her respective masts are fixed and have a pivot near the top so that the masts can be lowered to pass under bridges.
Main
The main tabernacle consisted of two oak cheek boards 11.5 cm (4.5 in) thick and 25 cm (10 in) wide, of a length to stand 1.07 metre (3 ft. 6 in) above the deck and reach down 1.52 metre (5 ft) to each side of the keelson, to which they are through bolted. The upper part of the boards are through-bolted to the forward (for’d) main cargo hatch beam. An oak cross piece, or cleat rail, is bolted on the fore edges of the cheeks 0.9 metre (3 ft.) above deck level with an iron mast band above it. Both cheeks are bored through their sides for a 5 cm (2 in) diameter steel pin upon which the mast pivots.
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| Main tabernacle |
Mizzen
The mizzen tabernacle is of similar construction, with 10 cm (4 in) thick cheeks which stand 0.9 metre (3 ft.) above the deck. The cheeks are bolted one each side of the keelson and to the forward (for’d) side of beam No.8, which also support the forward end of the
deckhouse.
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| Mizzen tabernacle |
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| Base bolted to the keelson. |
The crew is quite happy that no low bridges that require lowering the masts have been encountered on any of
Shamrock trips to date and hope it stays that way.
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