Boy's Manual Of Seamanship And Gunnery - Purchases

Boy's Manual Of Seamanship And Gunnery - Purchases

Contents

Blocks

Boy's Manual of Seamanship and Gunnery

Purchases

THEIR NAMES - HOW FITTED-STRENGTH - THEIR USE

NAME OF PURCHASE	POWER GAINED	HOW FITTED	REMARKS: GENERAL USE
Single whip.	None.	A rope rove through a single tail block, fixed in any position.	Is a purchase of least power in use ; it is used for all light work: discharging luggage from a boat, &c.
Double whip.	Twice.	A rope rove through two single blocks ; the upper block is a tail block, the lower one is a moveable hook block; the standing part of fall is secured with a round turn and two half hitches round the yard close to the tail block.	Is used for all common purposes, for clearing boats of things, &c., too heavy for a single whip.
Runner	Adds an additional power to the purchase it is used with.	Is a rope rove through any moveable blocks.	Is always used in connexion with another purchase, such as the runners, and tackle in staying lower mast, top-Burton and runners, &c., or setting up topmast rigging.
Spanish Burton.	Three times.	Composed of two single blocks, one stationary, secured by a tail, the other is a moveable block.	Used for coaling ship.
Luff tackle.	Three times ; four times if used in connexion with a leading block.	Two book blocks, one double, and one single. The standing part of the fall of this tackle is rove through a becket in the ass of the single block, and secured by being spliced round the strop at the neck of it.	Is used for all common purposes where a heavy pull is required, setting up rigging &c.
Tail jigger.	Three times.	Composed of a double block, fitted with two tails or one, and a single hook block. Standing part of fall is secured in the strop of single block.	Used for setting up topgallant backstays, &c.
Up and down tackle.	Three times; four times when used with a leading Block.	A double and single block the double block is fitted with a thimble for lashing to the lower pendants; the single block is a hook block, fitted with a long strop, the standing part of the fall is spliced in the strop of the single block.	Used for setting up lower rigging.
Gun tackle purchase, or double luff.	Four times.	Two double blocks, fitted with hooks; the double block intended for the standing part of fall, has a score in the ass of the block under one of the sheaves, to form a fair lead in reeving the fall through the other block.	Used as side tackles of guns, and preventer tackles.
Gun tackle purchase for boats' guns.	Twice.	Two single hook blocks; the standing part of the fall is spliced in the strop of the block, forming the final lead of the fall.	Used for boats gulls.
Quarter	Twice	Two single blocks, each fitted with & long pendant and hook, the lower one with a tongue for stay to hook to.	Hoisting in stores, provisions, water, &c.
Sail tackle	Three times	Three single blocks ; the strop of the tippet block is fitted with a long and short leg, a thimble being spliced in the end of the long leg, and a hook in the end of the short leg ; the third block is a leading block, stropped to the strop of the lower block, between the crown of the block and the hook ; the standing part of the fall is rove through a becket in the ass and secured round the strop at the crown of the upper block.	Is used for shifting or bending topsails; when in use the long leg of the upper block goes round the topmast-head, and hooks to the short leg of the same block. For staying topmast; often used as a preventer lower brace in small ships, and sending topsail yards up and down.
Top Burton	Three times.	Is composed of a double hook block, sometimes fitted with a long strop, and a single hook block fitted with a long strop, and with a long loose strop or tongue.	Used as preventer lifts or topsail yards, setting up topmast rigging, and for other purposes too heavy for whips.
Mizen Burton.	Three times.	A double and single hook block ; the standing part of the fall is spliced in the strop of the single block.	Used for sending the cross jack yard up and down, staying mizen-masts, &c.
Runner and tackle.	Eight times.	Consists of three blocks, one double, and two single; one of the single blocks is a clump fitted with a thimble as a lashing block, through which the runner is rove. The tackle is rove through the two other blocks. The double block of the tackle is turned in one end of the runner, and a hook and thimble in the other end of runner ; the standing part of the tackle is spliced in the ass of the single block, which is fitted with a long strop and a hook.	Used for staying lower masts, and weighing anchor when the capstan is disabled
Yard tackle.	Three times.	Two blocks ; upper block is a fiddle block ; turned in the end of the yard-tackle pendant, fitted with a long strop ; the lower is a single hook block, fitted with a long strop, in the ass of which the standing part of the fall is spliced.	Used for hoisting heavy weights in or out, such as boats, &c.
Topgallant purchase	Twice or thrice.	Two single blocks - the topgallant shrouds are fitted with a long and short leg, a sennit eye in each leg; the long leg is rove through a thimble in the crown of the upper block, and toggled to the short leg. The standing part of the fall is spliced in the ass of the upper block ; the lower block is a hook block.	This purchase is fitted for the purpose pose of setting topgallant rigging up smartly; the upper block in large ships is a double block.
Topgallant halyard purchase	Three times.	Two single blocks; the lower block is a hook block ; the upper block is fitted with a long strop, and when in use is toggled to a bight of the topgallant halyards or yard rope, a half hitch is formed with the yard-rope round the strop, and the bight put through the upper part of the long strop and toggled ; sometimes a double and single block is used, the double block fitted with two tails; another plan is a runner and two single blocks,	Is used when the topgallant sails are set for mast-heading the sails.

Lower lift purchase	Three times.	Two blocks-a double and single block; the double is the lower block, and stropped to an eye-bolt in the deck close to the mast; the single block is turned in a half strop in the lift.	Used for squaring or topping lower yards.
Threefold purchase.	Six times ; seven times when used with a leading block.	Generally fitted with two three-fold metal blocks.	Used for raising the screw in screw ships.
Four-fold purchase.	Eight or nine times.	Generally rove through two four-fold metal blocks.	Used where any heavy purchase is required.
Launches purchases.	Eight times.	Consists of a runner and tackle.	Used for hoisting the launch in or out. When the launches purchase is in use, the pendant or runner is rove through a block at the yardarm, led over the lower cap, and hooked to the opposite quarter of the yard. This purchase is seldom or never used.
Forestay tackle.	Three times.	Consists of a double and single block ; the double block is the upper block, fitted with a span with a hook in each end. The lower or single block is a hook block; standing part of fall is spliced in the strop of lower block.	Used for hoisting boats, or any heavy weights in or out.
Mainstay tackle.	Three times.	Consists of two blocks ; the double or upper block is fitted with a long pendant and hook ; the single or lower block is a hook block, with standing part of fall spliced in strop.	Used for hoisting boats or heavy weights in or out.

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