Whenever the city clerk shall become unable, by reason of sickness or otherwise, to discharge his duties, and there is no deputy clerk, the mayor and aldermen may appoint a clerk pro tempore, who shall perform all the duties of a clerk during such time as the incapacity may continue.
RSA 48:7
GS 43:5. GL 47:5. PS 49:6. PL 53 :6. RL 65:6.