340 Observations on the immense 
fixed on after the rope is made fast, by means of a thumb-screw 
detaching one-half of the shank, so that the traveller may be 
placed on the upper part of the rope; thereby obviating the in- 
convenience and danger of reeving the rope through the travel- 
ler *, 
An experiment being made with a three-inch rope stretched 
between two trees, it was found to answer the intended pur- 
pose. 
Lieut.-general Ramsey. Lieut.-colonels Bingham. 
Colonels Sir H. Framingham. _Phillot. 
Harris. Fyers. 
Fisher. Majors Fraser. 
Lieut.-colonels Pritchard. Payne. 
Beevor. Forster. 
Griffiths. 
In conjunction with Rear-Admiral Sir Charles Rowley, Cap- 
tains Gower and Ross of the Royal Navy, and Sir William Con- 
greve, Comptoller of the Royal Laboratory, 
(Signed) Joun Ramsey, 
Colonel and Lieut.-general Commandant. 
Certificate from Falmouth, December 4, 1817. 
“* We the under-signed do certify that we have at several 
times witnessed experiments made by Mr. Trengrouse of Hel- 
ston, with the apparatus invented by him for the preservation of 
shipwrecked seamen; from the results of which, we are satisfied 
such apparatus, if generally adopted, might be made productive 
of great public benefit; and might be particularly useful in the 
merchant service. 
Pellew, Collector of Customs Wm. Tomson, late of the India 
C. Severland, Agent to H. M. service 
Packets Robert W. Fox, jun. 
W. Broad, Agent to Lloyd’s James Edgcome, jun. Collector 
Richard Pellowe, Capt. R.N. Customs, Penryn 
George Bell, Capt. R.N. Michael Williams 
John Manderson, Capt. R.N. Robert Williams , 
John Bullock, Capt. H.M. Henry Williams, and sundry 
packet Walsingham others.” 
* Besides the advantages attached to the roller as here stated, it is so 
constructed that its most rapid use cannot produce friction upon the rope 
on which it works. ‘Two travellers are intended to be used at one time ; to 
the hooks of which is to be suspended a chaise roulante for persons to sit 
in, which is exceedingly simple and portable, and at the same time affords 
ci ape and security to the most helpless or infirm man, woman, or 
child. 
In making the experiment with the traveller, Colonel Phillot and two 
others were severally conveyed from one tree to the other, in the chaise rou- 
dante. 
Sir 
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