months

27,

31

Moon

19,

26,

27,

28,

30

odometers

12

pendulum

clocks

35

quartz

clocks

36

radar

guns

15

Romans

27,

29,

30

scales

23,

39,

48

shadow

sticks

32

solar

calendars

29

speed

of

sound

13

speed

13,

15,

16,

44,

45,

46,

49

speedometers

3,

49

stick

scales

22

storm

glass

41

sundial

32

temperature

37–39

thermometers

38–39

thunder

glass

41

time

25–36

tornadoes

47

units

of

measure

5,

6,

9

water

clocks

33

weather

37–49

weighbridge

23

weight

17–24

wind

socks

43

wind

vanes

43

wind

37,

43–47