Acoustic Transmission Check

I noticed a faint, rhythmic vibration traveling through the glass pane as morning traffic commenced. To verify the transmission line, I stepped away from the reflective foil beacon and approached the metal frame joint. A dropped wooden toothpick lay nestled in the sill track. Using both hands, I hoisted the slender timber and wedged one end firmly into the groove between the glass and the painted frame, resting the other against the edge of a terracotta pot. Pressing my hand against the wood, I felt the steady hum of passing streetcars conduct cleanly through the timber line. Signal reception verified.