Marsaut Lamp. – The Marsaut lamp, the invention of a well-known French mining engineer, only differs from a Clanny in having two gauzes (see Fig. 355) or three gauzes, each gauze tending to increase the safety of the lamp. On the other hand, the multiplication of gauzes interferes with the supply of fresh air to the flame. M. Marsaut was also the first, or one of the first, to make a shielded lamp.