362 Mr. Barlow on the effects produced in the rates of 
to the detail of particulars, to explain the views I had formed 
on the subject, and the principles upon which I conducted the 
experiments. 
I conceived, that if such an effect as that described by Mr. 
Fisher, were generally produced on the rates of watches and 
chronometers, it must arise from the spring, or some part of 
the balance having become magnetic, and the consequent 
attraction of the iron upon it. But this would lead us also 
to conclude, that accordingly as the balance was placed in 
this, or that direction, with respect to any given mass of iron, 
the rate of the chronometer would be accelerated or retarded, 
and not uniformly accelerated, as would seem to be the case 
by Mr. Fisher’s observations. Or rather perhaps I ought 
to say, that a different direction of the balance would alter 
the arc of its vibration, from greater to less, or from less to 
friends who have, in these experiments, favoured me with their advice and assistance. 
To my late colleague, the Reverend Mr. Evans, I am much indebted for the loan 
of his gold pocket chronometer by Earnshaw, and by his procuring for me, through 
the kindness of Mr. Pe n n ington, an excellent box chronometer by that Gentleman, 
marked No. 4 in the following series. To my friend Captain Lynn I am under an 
equal obligation, by his having entrusted to my care his very fine box chronometer, 
marked No. 3, and by his having procured for me, from Mr. Arnold, the silver 
pocket chronometer No. 2. These two were selected out of a great number which 
the former Gentleman was employed in rating, in consequence of their being de- 
cidedly the most uniform in their action. To Captain Coley and to Mr. Arthur 
Baily, I am indebted for my introduction to Messrs. Pa rkinson and F rodsham, 
who in the most liberal and handsome manner furnished me with the two chro- 
nometers No. 5 and No. 6. The latter of these is adjusted according to the new 
principle of these makers, and was made at the same time, and is in all respects 
similar to their chronometers No. 228, 253, 254, and 259, which were so much dis- 
tinguished in Captain Parry’s late voyage. To these Gentlemen I am also much 
indebted for the means of making the experiments, reported in a subsequent page, 
on the detached chronometrical parts of such a machine. 
