56 NIGH DLLS's SEAMANSHIP AND NAUTICAL KNOWLEDGE .
on deck as required. Bend a single gantline to the head of the topmast
and lower it down on deck with it. Tidy up the gear.
Derricks.—To rig derricks for discharging overside, keeping one as a
standing derrick and the other as a yardarm derrick. Shackle on the guys
and cargo gins, reeve ofE the runners, shackle on the_ cargo hooks. Top
the derricks up into position, one over the hatch and the other guyed
out to the side of the ship. If they are fitted with a chain span instead
of a topping lift, you will have to rig a tackle from the masthead with
which to lift them up. When you have 'got each one high enough
shackle on the chain span, then by easing up the tackle let the span
take the weight. See that all the guys are led away clear and set well
taut to maintain both derricks in their proper positions.
Figure 5 shows four 5-ton derricks with their heels mounted on a
table, and a 20-ton derrick with its heel stepped into a special fitting
on the deck. Note the cargo blocks, spans, falls and guys. The
telescopic topmast is housed. •
Questions
(1) Describe the rigging on a steamship's mast, how it is secured
at tiie masthead and the arrangements made for setting it up tight.
(2) How is any rope parcelled and served and what is the purpose
of this dressing on the rope?
(3) Name the parts of a mast.
(4) In what order is the rigging of a mast set up?
(5) Describe how you would house a telescopic topmast.
(6) How would you go about sending down a signal yard?
(7) Send up a telescopic topmast.
(8) Describe how a telescopic topmast could be unshipped.
(9) Take out the stump of a broken telescopic topmast.
(10) You are in a steamer fitted with a fitted topmast, how would
you send it down on deck?
(11) Describe the sending up of a fitted topmast.
(12) Describe how you would go about rigging derricks, hoisting
them up, and getting as much as possible done to be ready for dis-
charging cargo as soon as the ship is berthed, the ship just entering the
port.
(13) The ship has just finished loading, stevedores' gang have left,
describe how you would get everything into sea position, decks cleared
up ready for getting under way.