THE K.B.B. 
Microscope Illuminant 
AN ENTIRELY NEW DESIGN OF MERCURY VAPOUR 
LAMP WITH FUSED QUARTZ ENVELOPE, GIVING 
AN ABSOLUTELY STEADY MONOCHROMATIC LIGHT 
OF GREAT INTENSITY, THEREBY ENORMOUSLY 
INCREASING THE RESOLVING POWER OF MODERN 
OBJECTIVES 
THE LAMP HAS NO VACUUM, BUT WORKS UNDER 
ATMOSPHERIC PRESSURE. IT HAS NO STARTING 
MECHANISM. ITS LIFE IS PRACTICALLY UNLIMITED 
KELVIN BOTTOMLEY & BAIRD, ltd, 
KELVINGROVE WORKS, HITHER GREEN, 
LONDON, S.E.13 
Ad. No. 155 
