|g2 ON THE FECU1.A OF POTATOES, &C. 



The balance carrying the piece h back forms a very ad- 

 mirable banking without any extra apparatus, which is ge- 

 nerally done by some kind of stop on the hair spring, which 

 must have an irregular effect; the farther the pin is carried 

 back, the stronger the spring operates against It, and from 

 the extent where the piece may be forced back to, there 

 is play for near two whole circles of vibration, without any 

 possibility of upsetting. The balance of the model vibrates 

 about a circle and one third with extraordinary freedom, 

 though a course train of four wheels, a large and heavy ba- 

 lance, with only the power of a stout watch spring. I there- 

 fore think the power necessary to carry a train with this 

 escapement may be considerably less than any other of a de- 

 tached nature. 



Fig. 9 represents the axis d shown separately, in order 

 that the arm and pin h, and little palletjT, may be seen more 

 distinctly. 



Fig. 10 shows the balance wheel b, and the method of 

 locking and unlocking. 



S. MENDHAM. 



vir. 



On the Fecula of Potatoes, and some other British Vegela- 

 tables. B^ Mr. WiLLiAU Skrimshire, Jmw. 



To Mr. NICHOLSON. 

 SIR, Wisbech, Oct. 11, 1808. 



I 



Fake the liberty of sending for insertion in your valua- 

 ble Journal my promised communication on the fecula of 

 potatoes, and sotiie other vegetables growing in my neigh- 

 bourhood, 



I remain, yours, &c. 



Wm. SKRIMSHIRE, Jun. 



Assertions in a Since the paper published in the ninety-first number of 



foniier paper ^j^^ Journal was written, I have verified by the following ex- 



venned by tar- •' . '^ 



permients 



