The invention of the apparatus, legalized in 1879, for the determination of the flash-point of petroleum, was another piece of work which fell to him by virtue of his official position.
It has been found that variations in barometric pressure affect the flash-point and accordingly corrections have to be made in obtaining strictly comparative results at different pressures.
In other countries the flash-point standards differ considerably, as do the storage regulations.
The more important local authorities throughout the country have made regulations under the powers conferred upon them by the Petroleum Acts, with the object of regulating the " keeping, sale, conveyance and hawking " of petroleum products having a flash-point below 73° F., and the Port of London authority, together with other water-way and harbour authorities in the United Kingdom, have their own by-laws relating to the navigation of vessels carrying such petroleum.
To illuminating oil or kerosene a series of tests is applied in order that the colour, odour, specific gravity and flash-point or fire-test may be recorded.