/ 
Mm 3 
A CATALOGUE OF INSTRUMENTS. 
L, 
Knight’s azimuth ditto — — 5 
Ditto on friction wheels — *— IO 
Marine barometers; by these storms have been 
foretold at sea some hours before they happen 
ed 
Circular instruments, to answer the purpose of the 
sextant 
Dipping needles, from 12I. 12s. to — 31 
Optical Instruments. 
The best double jointed silver spectacles, with 
glasses — — — I 
The best ditto, with Brazil pebbles — I 
Single joint silver spectacles, with glasses O 
Ditto, with Brazil pebbles — — I 
Double-joint steel ditto, with glasses — O 
Best single-joint spectacles — O 
Ditto, inferior frames, from 2s. 6d. to o 
Nose spectacles, mounted in silver — O 
Ditto in tortoiseshell and silver — O 
Ditto in horn and steel — — ' Q 
Spectacles for couched eyes 
Spectacles with shades 
Concave glasses in horn boxes, for short-sighted 
eyes 
Ditto, mounted in tortoiseshell and silver, pearl and 
silver, in various manners, and at different prices 
Reading glasses, from 2s. 6d. to — 2 
Opera glasses, from 10s. 6d. to — 2 
Ditto on an improved construction, il. 7s. and I 
Ditto to be used at sea by night — I 
Diagonal operas of a new construction — I 
549 
s. d. 
15 6 
10 o 
IO o 
I o 
16 o 
15 o 
10 o 
7 6 
5 o 
3 0 
7 o 
4 o 
i o 
L O 
2 O 
ii 6 
II 6 
I o