grain of time

Exploration Stage: Historical Museum
From: Ursula Hartley
Description: I have to disagree with Director Black on this one! The chronometer had been in the house for a long time. There were no footprints, but there were layers of dust. I also took a sample. Will you help me find it?
Completed: Thank you. With a dust sample, I should be able to approximate the amount of time that has passed since the house was abandoned. I'll check the dust density... my guess is that no one has entered the house in years.