SIMPLEAND
COMPLEXTACKLE
A singlewhipwithonepulley
(') doesnotreducetheeffort
requiredtolifta weigh.A
runner(2)dividesinhalfthe
effortnecessarytomovea
weigh.Tacklewitha double
whiphastheropepassing
throughtwoblocks.one
standingandtheother
moving(3.4).Riggedas
here,italsoreducestheeffort
toa half.Thistackleisused
ontheboomsheetcarriages
ofsmallsailingboats.by
buildersforhoistingconcrete
bucketsorsmallloads,andto
secureloadsonroofracks.
Thearrangementillustrated
infigure 5 spreadstheload
2