How many storeys does this tower house have which David Gregory inherited in 1664?
David Gregory (physician) David Gregory (20 December 1625 – 1720) was a Scottish physician and inventor. His surname is sometimes spelt as Gregorie, the original Scottish spelling. He inherited Kinnairdy Castle in 1664. Three of his twenty-nine children became mathematics professors. He is credited with inventing a military cannon that Isaac Newton described as "being destructive to the human species". Copies and details of the model no longer exist. Gregory's use of a barometer to predict farming-related weather conditions led him to be accused of witchcraft by Presbyterian ministers from Aberdeen, although he was never convicted.
Balthayock Castle Balthayock Castle, also known as "Tower Of Balthayock", is a medieval tower house located 3 miles east of Perth, Scotland. It was built in late 14th century. It is measured at 52 by 37ft and has very thick walls. The Balthayock castle is said to have been owned by family of Blair since the time of William I (1165-1214). It was very ruinous prior to 1870. James Maclaren saved the tower by building the present battlements, modern roof, caphouse, forestair to the entrance and also altered the interior. It was inhabited until the middle of the last century. It is now unoccupied but is in good condition.