Soon afterwards he was appointed master of Warminster School, where he had twenty boys to teach, with a salary of £30, and liberty to take private pupils.
at Cambridge University in 1807; succeeded Dr. Goddard as head-master of Winchester College in 1810; was presented to the rectory of Ashow, Warwickshire, in 1812, and that of Binfield, Berkshire, in 1820; resigned the head-mastership of Winchester College in December 1823, receiving a present of plate richly engraved from the scholars.
Gabell married, on 11 Jan. 1790, Miss Gage, the daughter of a clergyman of Holton, Oxfordshire.
Gabell was a friend and correspondent of Dr. Parr, in the seventh volume of whose works some letters of his on points of classical scholarship will be found.
A pamphlet entitled 'On the Expediency of Altering and Amending the Regulations recommended by Parliament for Reducing the High Price of Corn: and of Extending the Bounty on the Importation of Wheat and other Articles of Provision,’ London, 1796, 8vo.