Photoflash cells were in production during the flashbulb era, and were slowly phased out as alkaline cells came into general usage. The photoflash cell was produced as a 1.5 volt size D and size C cell.
The carbon cathode (the material packed between the carbon rod and zinc shell) of a zinc-carbon cell is generally made of powdered carbon black (or acetylene black), MnO2 and electrolyte. The MnO2 to carbon ratios vary between 10:1 and 3:1 for general purpose cells. A 1:1 mixture was used for photoflash batteries, for this allowed a high current output with intermittent use - just perfect for photoflash use.
Photoflash Battery - A combination of individual cells are combined in series to make a battery. One zinc-carbon battery for photoflash use is available as a 510 volt unit Another is the Eveready 225V Photo Flash Carbon Zinc Battery - EVR489