46. Q. What type of incandescent lamp is used in the reflector?

A. A low voltage, gas filled bulb, containing a very compact or

concentrated fillament.

47. Q. Why cannot a standard or house type of lamp be successfully used

in the reflector?

A. Because the fillament or light-giving wire inside the bulb is not

sufficiently compact or concentrated to reflect the light in the form of

a beam. The voltage of the house lamp is also too high to be used on a

locomotive installation.