BIT wit Electrometers. 
thirteen feet and depth five feet. With two hundred pas- 
sengers it draws forty eight inches of water. The weight 
of iron is twelve and a half tons, rather less than that of a 
wooden vessel of Jess internal dimensions. It is found to 
be more easily tacked than a wooden boat.—Idem. 
10. Supply of Water to Glasgow. 
The city of Glasgow is supplied with water from the 
ly de. This stream is commonly very turbid, but the wa- 
> filters through a body of sand into a well on the left 
bank of the river. Into this well dips a flexible iron tube 
which passes across the river, lying on its bottom. ‘Three 
engines are employed on the other side to raise the water, 
two of thirty-six inch cylinders and seven feet stroke, and 
one of fifty-four inch cylinder and eight feet stroke. The 
flexible tube is the invention of the late celebrated J. Watt. 
He derived his first idea of it from observing a aaa Fi tail. 
BAT ee et See i _ Idem. 
: Ss ale Air and Water support Vegetation. 
A fig tree, seven anda half feet high, with a stem five 
and a half inches in circumference, is growing luxuriantly 
in the hot house of the botanic garden of Edinburg, com- 
pletely suspended from the ground, and without a_ particle 
earth to nourish it. Water is thrown over it every day: 
es ‘ ; Pere ae aye ia) ; Idem. 
J ek Electrometers. 
The Abbe Haiiy has contrived two very delicate and 
useful electrometers. Ist. A fine crystal of Iceland spar 
attached to the end of a lever, and suspended by a silken 
string, 1s electrified vitreously by simply pressing it between - 
two fingers. It retains its excitementtwo hours; and is not 
much altered by dipping in water. 
i F 
etains its excitement much longer that when sus- 
—F 
