Waterspouts observed on 24 May 1788 (Figs. 1 and 2), 8 January 1789 (Figs. 3 and 4) and 12 April 1789 (Figs. 5 and 6) by Francis Buchanan (1762–1829) a Scottish physician, geographer, zoologist and botanist, during his voyages to India.
Waterspout on 24 May 1788
"[...] I observed a curve spout come from the cloud, as shown in Plate IX. Fig. 1. b, the concavity of the curve being windward. At the same time, or at the next moment after observing the spout, I perceived a thick cloud or fog arise from the sea, c. Very soon afterwards, the spout rushed down and joined the cloud, which had risen from the se; and, at the same time, thin rose higher, and contracted its diameter, as in Fig. 2.
The water spout being now completely formed, the appearance of it was as follows: The cloud a, from which the spout descended, moved slowly along, and probably, by this means, produced the curvature in the spout. The body of the spout b, tapered gradually downwards, and was seemingly more dense than the cloud from which it descended, but not more dense or black than cloud often are. The fog coming form the sea was of the same colour as the spout, and resemble the smoke of a steam-engine. During the whole time, the surface of the sea under the spout was evidently in violent agitation, and full of white waves; at the same time noise was heard, like that of an immense waterfall. From the formation of the spout, till the time it reached the cloud arising from the sea, appeared to be about two minutes. The spout then began to withdraw itself into the cloud, from whence it had descended; while the cloud bellow gradually withdrew into the sea; and in about three minutes all was over, and the thick cloud in the sky, in a short time, was entirely dispersed. " (Buchanan 1821, p. 275– 276).
Waterspout on 8 January 1789
"[...] at half-part eight in the morning, we observed like a thick cloud resting on the sea, Fig. 4. a, and bearing from us from W. by N. from four to six miles distance. [...] To the southward of it was a heavy rain, b. [...] A spout then came down from the cloud in the form of an elbow; but before he gave me notice, the spout had disappeared, and nothing remained except the cloud on the water.
About half an hour afterwards I was informed, that the spout has returned. Upon coming on deck, I observed the cloud Fig. 3. a, and the rain b as before; and a new spout was then formed, where the former has been. The spout c was cylindrical, and slightly bent by the wind to the north. Below it terminated in a point about 300 feet from the sea; above it was suspended from the cloud, but became rather narrower, having sent off two branches d, d. It was every where of a define form, and much of the same density with the cloud. In looking at it with a glass, I at first took it to be hollow; but I soon discovered, that this was owing to the middle appearing lighter than the sides, as it must do from the known laws of optics. From the sea arose a circumscribed conical cloud e, nearly of the same density with the spout. After continuing about then minutes by a watch, the spout and both clouds became gradually lighter coloured, till they entirely disappeared." (Buchanan 1821, p. 277).
source: Buchanan, F., 1821: Account of Water-Spouts observed at Sea on Voyages to and from India. The Endinburgh Philosophical Journal, 5, 275–279. (courtesy of Google books).