INTRODUCTION. 
VII 
List of the Instruments, <^c. embarked on hoard each of the two Ships. 
Those marked with an Asterisk were furnished to the Hecla only. 
* 2 Astronomical Clocks, with stands. 
11 Chronometers on board the Hecla, and four on board the 
Griper. 
* 1 Transit instrument. 
* 1 Portable observatory. 
* 1 Repeating circle. 
1 Dipping-needle. *A second ditto, the property of Henry 
Browne, esq. 
* 1 Instrument for magnetic force, on Captain Rater’s improved 
construction. 
* 1 Variation transit. 
* 1 Variation needle. 
4 Azimuth compasses, on Captain Rater’s improved construction. 
1 Dip-sector, invented by Dr. Wollaston. 
2 Mountain barometers. 
2 Marine ditto. 
2 Altitude instruments, invented by Captain Rater. 
1 Theodolite. 
2 Anglometers. 
1 Circular protractor. 
3 Artificial horizons. 
1 Hydrometer. 
1 Water-bottle, invented by Dr. Marcet. 
10 Thermometers. 
* 4? Self-registering ditto, (Sixe’s), with iron cases for fastening to 
the deep-sea lead. 
2 Electrometers, with chains. 
Together with a complete set of drawing instruments, scales, beam- 
compasses, <fc. for the construction of charts. 
