The little building in the Kirkyard of Cadder is the Watch House and has a “Mort-safe”, as in many churchyards of the same period in Scotland. The mort-safe which required several men to lift it, was placed over a newly interred coffin for several days then removed for re-use, while after a funeral a small group of relatives and church office-bearers would mount a guard for several nights in the watch house, often armed with an ancient blunderbuss to strengthen their courage.

References
Cadder Parish Church website