Waterpressure listener. A very sensitive microphone, so you can find out if there is water flowing in the pipe under the grund.4yr ⋅ ThomaZzzzq ⋅ r/specializedtools
The old wood roller-coaster at Dyrehavsbakken. When it was build in 1932, it was the biggest in Europe. Today, it's not the tallest /fastest /longest, but it's very charming and fun.5yr ⋅ ThomaZzzzq ⋅ r/rollercoasters
