| Description | ' Sir Christopher Wren the President in the Chair.
Sir John Hoskins gave an Account of the Italian Booke Intitled Pratica Minerale trattato del Marco Antonio Della Fratta, the substance of which he promised to put into writing the next day.
The President gave an Account of Redis and Bartoli's Bookes which he alsoe promised to put into writinge and shew the Society at the next meeting.
The same acquainted the Society with an observation he he had formerly made about this Motion of the Superficies of undulating water which he had taken notice of by the motion of a Corke floting in it and said that the Corke did not keep exactly rising in a perpendicular line but had alsoe a laterall motion the composition of which two together made the Corke move in an Ellipse.
The same Related that Esckinardus had demonstrated that the first figure for a Specular burning Glass was a Sphericall concave which was much better then a parabolicall concave
He also gave an Account of Eschiniards way of Graduating and adjusting Thermometers. Mr Hooke gave a full account concerning the way of Adjusting Thermometers by a Standard according to which all that were made by Richard Shortgrave were adjusted: a short account of which he had formerly published in his Micrographia.
A part of a Letter from Mr Papin to Doctor Crone was Read wherein he mentioned his presenting of his Boyling Engines to the Society and also hie desire and readiness to serve the Society in the places where he should reside.
An Experiment was made in Mr Papin's Engine wherein were put peices of Ivory of Horne and of Tortoise Shell, all these were in about the space of halfe an houre Reduced to softnesse, the Tortoise shell to the softnes and pliabblenes of shoe leather or tand leather, the Ivory to the consistence of Old chedder Cheese, the Horne to the softnes and pliableness of pretty stiff Leather. ' |