Arnulph Henry Reginald Mallock, FRS (12 March 1851 – 26 June 1933) was a British scientific instrument designer and experimentalist.
Amongst many other commissions he designed equipment to measure earth tremors caused by railways, slight movements in St Paul's cathedral and several bridges.
An original investigator and experimentalist in various branches of physical science, who has invented and improved many instruments of high scientific value.
Also of Papers published in Reports, Brit Assoc; Trans Inst Nav Arch; and other Scientific Journals, &c." [2] A supplementary citation read: "The skill and insight exhibited by Mr Mallock in work done for the Vibration Committee appointed about two years ago by the Board of Trade was acknowledged in highly laudatory terms in the Report of the Committee.
After his death his widow presented the Royal Society with the sextant that had belonged to Brunel.