Kerosene.

After making a test with Linley semaphore lamps (as to their capacity and the time they will burn when filled) I find they hold one quart of kerosene and will burn night and day for a week with one filling. At the end of that time there is almost a pint of kerosene left. It would appear that at a station with two home and two distant signals (where no kerosene is page 23 required for station lighting) one tin of 41/6th gallons per four weeks would suffice. It would be quite simple to make a test for lighting purposes, as lamps are of a standard pattern. When it is known how long a lamp burns with one filling it would be easy to work out the consumption for a given period.

Waste can occur when the cisterns are emptied periodically, if the oil is not first drained off.