Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 MICROSCOPE LAMPS 163 A disk of ' daylite ' glass inserted between bulb and condenser adds greatly to the usefulness of the lamp, or one may employ a Bausch & Lomb ' auxiliary condenser ' which has a ' day- lite ' combination in the mounting. A tungsten filament microscope lamp closely approximating an arc lamp in intensity and character has been recently described by It consists of an American locomotive headlight lamp, having a very concentrated filament. It consists of a gas-filled
Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 MICROSCOPE LAMPS 163 A disk of ' daylite ' glass inserted between bulb and condenser adds greatly to the usefulness of the lamp, or one may employ a Bausch & Lomb ' auxiliary condenser ' which has a ' day- lite ' combination in the mounting. A tungsten filament microscope lamp closely approximating an arc lamp in intensity and character has been recently described by It consists of an American locomotive headlight lamp, having a very concentrated filament. It consists of a gas-filled 6 volt, 108 watt, lamp with mogul base. The housing is of the Gage ' Chalet '' type shown in Fig. 97. A plano-con- vex lens provides for either parallel or converging light ac- Fig. 96. Tungsten Lamp with Con- centrated Filament. Fig. 97. Bausch & Lomb Optical Co. ' Chalet ' model microscope lamp with ' Daylite ' glass. (Gage)Xi cording as the lamp-bulb is moved forward or back in the housing. Although, optically, the performance of tungsten incandes- cent lamps is not equal to that of arc lamps, their greater con- venience, steadier light and absence of adjustment annoyances render them almost indispensable to the microscopist. In England a newly developed tungsten arc lamp known to the trade as the ' Pointolite ' lamp has received much favorable 1 Gage, S. H.: Modern Dark-field Microscopy. Trans. Amer. Micros. Soc. 39 (1920) in.
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