.7-4 



•A Catalogue of Instruments. 



Philofophical Inftruments. 









j. 



Improved electrical machines, from 3I. 13s. 6d. to — 



40 



0 



.0 



; Electrical machine and apparatus, in a box, from 61. 16s. 6d. to 



•,12 



12 





. Medical apparatus — — \ . — 



2 



2 



. 0 



, Electrical machines, with a (elected apparatus, in a box, -from/l. 



7s. to 31 



,10 





Batteries, and all other parts of an electrical apparatus 







Small fingle-barrelled air pump 









Small double ditto — — - — 



i 



14 



€ 



A large ditto < — ■ ■■ - — - 



6 



16 



6 



Table air pump — — - 



10 



-LO 



0 



An improved air pump, fuperior to Smeaton's conftruction of the pump 







Apparatus to an air pump, from. 4I. 4s. to — 



.3° 



O 



0 



Barometers — — - — 



. . . 



2 



.0 



Ditto — — — — 



2 



12 



6 



Barometers, thermometers, from 3I. 3s. to — 





5 



0 



Marine barometers 









Thermometers, in mahogany boxes, from 1 1. is. to — 



1 



11 



6 



Ditto with Reaumur and Farrenheit's fcales 









Botanic thermometers ■ — — - — - 



0 



18 



D 



Thermometers for brewers, from 1 2s. to — 





2 



O 



Hygrometers, from 10s. 6d. to — — 



3 



T 3 



.6 



The mechanic powers, comprifed in a fmall neat form — 



21 



.0 



0 



Ditto, fitted up on a larger fcale, with improvements 









An apparatus for making experiments on accelerated, retarded, and rotatory 







motion 









A mechanic apparatus fitted up for the purpofe of instructing 



young 







people, &c. — — 



26 





0 



A pneumatic apparatus, fitted up for the fame purpofe 



16 



16 



0 



An electrical apparatus, fitted up on the fame plan 



7 





0 



A magnetical apparatus, from. 2l. 12s. 6d. to - ■ •<* 



10 



10 



0 



Conductors for fhips, to preferve them from lightning - — — 



5 



5 



0 



^.w-J :V '• . E R R A T A. 



Page 2, line 15, for animalculas read animalcula, 



8, — 22, for animalculas read animalcula. 



375, *— 17, for eggs read chickens. 



