94 Capt. Kater’s experiments for determining the 
An objection might be urged against the use of the knife 
edge, on the ground that being an elastic substance it may 
possibly suffer temporary compression, and thus perhaps in- 
troduce a source of error. In order to meet any doubt that 
might arise on this important part of the subject, it is my 
intention to commence a series of experiments with a pendu- 
lum of the same construction as that which has been described, 
but vibrating on cylinders instead of knife edges, and I trust 
soon to have the honor of laying the result before the Royal 
Society. 
London, July, 18x7. 
