Apparatus for measuring liquid developer flow rate

An apparatus for measuring the flow rate of aqueous ammonia in a diazotype copy machine, comprising:

• a supply source for aqueous ammonia;
• a flowmeter means;
• means for supplying the aqueous ammonia from the supply source to the flowmeter means;
• metering means for dispensing metered quantities of the aqueous ammonia from the flowmeter means;
• reservoir means mounted on the flowmeter means for receiving the aqueous ammonia dispensed therefrom;
• valve means actuable between a closed condition for retaining the aqueous ammonia in the reservoir means and an open condition for draining the aqueous ammonia from the reservoir means;
• and
• indicator means on the reservoir means for measuring the flow rate, subsequent to actuation of the valve means from the open to the closed condition, providing an indication of the quantity of aqueous ammonia received by the reservoir means relative to a predetermined time period.