Under Pressure

A bit of an emergency blip tonight; the only photos today were of a giant spider web with Mr Flum's jacket behind it and some to record Miss Flum's spectacular reaction to a bite (for which she is now receiving antibiotics and awaiting serology results) which is not a pretty sight.

Here instead is a barometer which we've brought from Mr Flum's mother's house (nearly done now, just the stuff nobody wants).

As it was made in Sunderland it must have belonged to Mr Flum's father's family. It's an attractive piece but it doesn't read the same pressure as our own barometer (29.5 as against 30.2) so we really need to calibrate them. Anyone know how?