[ 866 ] 
fpheroid or cylinder, having a rotatory motion about any momentary axis, is com- 
puted, p. 289 — 295. 
B. 
Barker (Sir Robert) his account of the Bramins’ obfervatory at Benares, p. 598. See 
B rami ns' Obfervatory . 
Barker (Thomas, Efq;) an extrad of his regiller of the barometer, thermometer, and 
rain, at Lyndon, in Rutland, for the year 1776, p 350. See Lyndon. 
Barometer . Experiments and obfervations made in Britain, in order to obtain a rule 
for meafuring heights with a barometer, p. 653. Mr.De Luc the molt fuccefsful in 
meafuring vertical heights with the barometer, p. 654, 655. Rule deduced from 
his obfervations on Saleve, p. 655, 656. Expanfion of quickfilver in the tubes of his 
barometers refulting from the Saleve obfervations, p.656 — 658. Defcription of the 
barometer with which Col. Roy’s experiments were made, p. 658, 659. Experi- 
ments on the expanfion of quickfilver, p. 659 — 681. Rate of expanfion of a column 
of quickfilver in the tube of a barometer, p. 682. Conftrudion and application 
of a table of equation for the expanfion of quickfilver in the tubes of barometers, 
p, 683 — 686. The equation to be applied to the obferved height of quickfilver in 
the barometer, from 15 to 31 inches; and for differences of temperature extending 
to 102 0 of Fahrenheit; whereby the column is reduced to the height it would have 
flood at in the temperature of 32 0 , p. 687. Experiments on the expanfion of air in 
the manometer, p. 689 — 696. Thermometrical fpaces compared with thofe of the 
manometer, p. 697. Experiments for determining the adual expanfion of common 
air in the manometer affeded by the heat of 212 0 , p.698 — 715. An account of 
barometrical obfervations made in Britain, wherein they are compared with fome 
others of the fame kind made in diflant countries, p. 715 — 749. Principles on 
which the table of equation for the heat of air was conflruded, p. 749 — 759. Re- 
marks on the error of the rule in the tables of computation, and a method of bringing 
the theory of the barometer to greater perfedion, p.759 — 770. The equation de- 
pending oh the temperature of the column of air, and its elevation above the fea„ as 
denoted by the mean height of mercury in the inferior and fuperior barometers, 
p. 771. Computations of barometrical obfervations made on heights in and near 
London, p. 773. Computations of thofe made on heights near Taybridge in Perth- 
fhire ; and of thofe near Lanark, p.775. Computations of thofe made on heights 
near Linhoufe ; and of thofe near Carnarvon in North Wales, p. 779. Computations 
of part of Mr, De Luc’s barometrical obfervations, anfwering to the coldeft: and 
hotteft temperatures of the air, p. 7 1 1—784. Mr. De la Caille’s barometrical obfer- 
vations at the Cape of Good-hope, p.784. Computations of barometrical obfer- 
vations made on heights that have not been determined geometrically, p. 785. Com- 
putations of Mr.Bouguer’s obfervations in Peru, p. 787. 
Barometer* 
