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held to the fire, burned Gloves and Garments at the distance of about three foot from the Fire.
Which were the particulars, the R. Society observed in these Glasses, and gave order to be Registred in their Books; encouraging the Inventor to proceed in this Work with all possible care and diligence, for enabling himself to instruct others in the way of Grinding these Glasses with facility.
The Inventor having declared his resolution to do so, added these Particulars. First, That the Lord Bishop of Salisbury, Seth Ward (who was then absent from the Meeting of the Society) had been by, when the deeper of his two Concaves turned a piece of Wood into flame in the space of ten seconds of time; and the shallower, in five seconds at most, in the season of Autumn, about 9 of the Clock in the Morning, the Weather gloomy*.* This the said judicious Prelate at another Meeting of the Royal Society, attested to be true. Secondly, That the deeper Concave, when held to a lucid Body, would cast a Light strong enough to read by at a considerable distance. Thirdly, That exposing the same to a Northern Window, on which the Sun shined not at all, or very little, he had perceived, that it would warm ones hand sensibly, by collecting the warm'd Air in the day-time, which it would not do after Sun-set.
An Account
1. Our Diurnal Tides, from about the latter end of March till the latter end of September, are about a foot higher (perpendicular, which is always to be understood) in the Evening than in the Morning, that is, in every Tide that happens after 12 in the day before 12 at night.
2. On the contrary, the Morning Tides from Michaelmas 'till our Lady-day in March again, are constantly higher by about a foot than those that happen in the Evening. And this proportion holds in both, after the gradual increase of the Tidesrising
