TRANSACTIONS OF THE SECTIONS. 
579 
formed from the following statement:—the number of lengths 
of wire in the last tube made for Mr. Hemmings is 4200 ; the 
internal diameter of the tube is % inch, and the diameter of the 
rod in the centre is rather more than £ inch thick. 
6 . METEOROLOGY. 
Notice of the Tliermometrical Observations now making at De- 
vonport , near Plymouth . By George Harvey, F.R.S.E. &c. 
In this communication Mr. Harvey describes the plan which, 
through the liberal encouragement of Major-General Sir John 
Cameron, K.C.B., Commander-in-Chief of the Western Di¬ 
strict, and the active zeal of Col. Pym, of the Royal Artillery, 
he has been enabled to put in execution, for the fulfilment of 
the recommendation of the former Meeting of the Association 
at York, relating to the establishment of an hourly register of 
the thermometer at one of the military or naval stations on the 
south coast of England. The thermometer is placed with a 
northern aspect, in the open square of the Royal Artillery, 
within a few yards of Col. Pym’s quarters, and is sheltered from 
the influence of the sun, and the effects of local heat, by a 
wooden erection, having its sides, its back and its roof formed 
of double planks, the intervals being filled with sawdust. The 
observations are at present taken, every two hours, by the non¬ 
commissioned officers who go round with the relief-guard ; but 
arrangements are in progress by which the register will be 
completed for every hour. The observers show the utmost 
attention to accuracy. 
Notice of the Establishment of a Register of hourly Observa¬ 
tions of the Thermometer , in the Dock-yard at Plymouth . 
By William Snow Harris, F.R.S. 
Mr. Harris has been enabled, with the sanction of Commis¬ 
sioner Ross, to set up a thermometer at Plymouth, in the 
Dock-yard, which continues to be registered every hour du¬ 
ring the day and night. It is placed in an open spot, under an 
appropriate screen, at about 80 feet above the level of the sea, 
and is so contrived, that by means of a T square, which slides 
in a groove in the scale, marks, corresponding to the height of 
the mercury, can be made on an adjoining slate, at the time of 
entering the observation. The marks and entries can be CQjn- 
2 o 2 
