Date: First quarter of the 20th century
Weight: 2.12 kg
Carriage tachometer made by RBM. This was one of the first tachometers to be made, and is particularly unusual for its characteristics. The clockwork mechanism of the tachometer is housed within a particularly solid metal capsule. This capsule opens in two halves, with the winding mechanism operated by a wheel on the top half, which also serves to hold the sheet of paper marking the time intervals. The rest of the mechanism, including the paper punch, is located in the lower half.