Pound lock 2 Lock (water navigation)

-


model of river pound lock, constructed in lankheet water park, netherlands


the natural extension of staunch provide upper gate (or pair of gates) form intermediate pound need emptied when boat passed through. type of lock, called pound lock known in imperial china , europe note change in terminology: on british canal, section of canal between locks called pound.


pound locks first used in medieval china during song dynasty (960–1279 ad).the songshi or history of song dynasty, volume 307, biography 66, records how qiao weiyue, high-ranking tax administrator, frustrated @ frequent losses incurred when grain barges wrecked on west river near huai’an in jiangsu. soldiers @ 1 double slipway, discovered, had plotted bandits wreck heavy imperial barges steal spilled grain. in 984 qiao installed pair of sluice-gates 2 hundred , fifty feet apart, entire structure roofed on building. siting 2 staunch gates close 1 another, qiao had created short stretch of canal, pound-lock, filled canal above raising individual wooden baulks in top gate , emptied canal below lowering baulks in top gate , raising ones in lower.



the turf-sided monkey marsh lock on kennet & avon canal @ thatcham








Comments

Post a Comment

Popular posts from this blog

CACHEbox ApplianSys

-
cachebox230 server appliance cachebox s caching engine employs code squid project. in 2005 launched becta approved protex content filtering service in collaboration east of england broadband network, represent more 2800 schools across 10 authorities. in 2006, acquired assets , customer base of rival freedom2. has since expanded activity north american schools market , caching device requested schools 2015 e-rate funding.
Read more

Kinship systems Apache

-
hide painting depicting apache girl s puberty ceremony, naiche (chiricahua apache), ca. 1900, oklahoma history center the chiricahua language has 4 different words grandparent: -chú maternal grandmother , -tsúyé maternal grandfather , -chʼiné paternal grandmother , -nálé paternal grandfather . additionally, grandparent s siblings identified same word; thus, 1 s maternal grandmother, 1 s maternal grandmother s sisters, , 1 s maternal grandmother s brothers called -chú. furthermore, grandparent terms reciprocal, is, grandparent use same term refer grandchild in relationship. example, person s maternal grandmother called -chú , maternal grandmother call person -chú (i.e. -chú can mean child of either own daughter or sibling s daughter.) chiricahua cousins not distinguished siblings through kinship terms. thus, same word refer either sibling or cousin (there not separate terms parallel-cousin , cross-cousin). additionally, terms used according sex of speaker (unlike english terms broth...
Read more

Western Apache Apache

-
a western apache woman san carlos group western apache include northern tonto, southern tonto, cibecue, white mountain , san carlos groups. while these subgroups spoke same language , had kinship ties, western apaches considered separate each other, according goodwin. other writers have used term refer non-navajo apachean peoples living west of rio grande (thus failing distinguish chiricahua other apacheans). goodwin s formulation: apache peoples have lived within present boundaries of state of arizona during historic times exception of chiricahua, warm springs, , allied apache, , small band of apaches known apache mansos, lived in vicinity of tucson. cibecue western apache group, according goodwin, north of salt river between tonto , white mountain apache, consisting of ceder creek, carrizo, , cibecue (proper) bands. san carlos. western apache group ranged closest tucson according goodwin. group consisted of apache peaks, arivaipa, pinal, san carlos (proper) bands. arivaipa (also ara...
Read more