The year 1726 in science and technology involved some significant events.
Botany
October 27 – Caleb Threlkeld publishes Synopsis Stirpium Hibernicarum .....Dispositarum sive Commentatio de Plantis Indigenis praesertim Dublinensibus instituta in Dublin, the first flora of Ireland.[1]
For clocks, the gridiron pendulum is developed by John Harrison, as a pendulum that compensates for temperature errors: a grid of alternating brass and steel rods is arranged so that the expansion due to heat is dissipated.[2]