Bausch & Lomb Optical Company As an automatic lamp, this can only be used on direct current, but by disen- gaging the automatic mechanism it is readily transformed into the hand-feed type for use on either current. A rheostat must always be used with this lamp to regulate the current. Note—This… … Figure 1—400-Watt Gas-Filled Mazda Lamp. The new gas-iilled Mazda lamps with concentrated filament, which have been especially developed for projection purposes, furnish an automatic, steady-burning and very efficient and economical light source for the simpler types of Balopticons. The efficiency…
