I will be telling you about the mercury barometer, the vacuum pump, the pendulum clock, and Robert Boyle.

Before, the mercury barometer people didn’t think vacuums existed. Then Torricelli came and explained how the vacuum is real and that lead to the making of the barometer. The barometer was a bowl filled with mercury and a tube filed with mercury. The person using it would open the bottom of the tube and a certain amount of mercury would come out, depending on the elevation that the barometer was in. However, there would be a vacuum at the top of it holding it in place.

The vacuum pump was small and sucked air in. It had two dials, one on the right and one on the left. The one on the left shows how hard it is to pump air in, and the one on the right shows the pressure in the space it is pumping from. The vacuum pump was also used to pump water out of mines in order to make the ground in the mine soft so that mining the metals or pumping oil was easier.

Before the pendulum clock there were clocks in homes but no clock towers. The clock had a weight connected to it that pulled some wire that was attached to the gear, and then that gear pulled all the other gears. The pendulum clock made it so that people could walk down the street and know what time it was!

Robert Boyle was very interested in science so he invented the beaker. The beaker is a glass or a plastic container, with a little spout located at the top. Typically scientists use them to keep mixtures in containers.

My favorite invention is the pendulum clock because now there are clock towers!