Egg timers are spring powered.
Alesae Westwood Mac timers Tesco Sansbryesw
No. A chronometer measures time. Wrist watches, egg timers, and hour-glasses are chronometers.
Most egg timers would work in space (zero gravity) apart from the sand hourglass type. The rely on springs and gears to keep time not weights.
The calcium that makes the egg shell makes it hard.
I would use my watch, or the timer function of my microwave. Or you can start both timers at the same moment, before putting the egg in the water. When the 3-minute timer ends, put the egg in. This leaves 2 minutes on the 5-minute timer, assuming both timers are relatively accurate. When the 5-minute timer ends, re-set it again for 5 minutes, and you will have your 7 minute egg when the timer ends.
Vinegar makes the egg wrinkly/takes off the shell and water makes and egg stronger
We even have a Rick and Morty Countdown timer on youtube now! Haha!
Waterbury Timers was created in 1947.
The Old Timers was created in 1957.
The Short-Timers was created in 1979.
The Short-Timers has 192 pages.