Low Technology
air transits
aqueduct
arch with keystone
astrolabe
backpack
balls
bridges
candle
frisbee
glass chip wrist watch
Greek chalice amplifiers
Greek water stage
ice skates
INCLINED PLANE**
LEVER**
mechanical clocks
mechanical pump
morning hygiene
propeller
pulley*
rocking chair
roller blades
screw*
siphon
skylights
sleds
sun dial
toilet bowl
toilet paper
tooth brush
top
tracking animals
wagon
water tower
water wheel
wedge*
WHEEL AND AXLE**
wind mill
yo yo* one of 6 basic simple machines
** one of 3 elemental simple machines from which ALL others can be made