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The sector on a quadrant, or A treatise containing the description and use of four several quadrants two small ones and two great ones, each rendred many wayes, both general and particular
Each of them accomodated for dyalling; for the resolving of all proportions instrumentally; and for the ready finding the hour and azimuth universally in the equal limbe. Of great use to seamen and practitioners in the mathematicks. Written by John Collins accountant philomath. Also An appendix touching reflected dyalling from a glass placed at any reclination -
Mr. De Sargues Universal way of dyaling, or, Plain and easie directions for placing the axeltree and marking the hours in sun-dyals, after the French, Italian, Babylonian, and Jewish manner
together with the manner of drawing the lines of the signs, of finding out the height of the sun above the horizon, and the east-rising of the same, the elevation of the pole, and the position of the meridian -
The whole art of reflex dialling
shewing the way to draw all manner of dialls which shall shew the hour by a spot of light reflected from a glasse upon any cieling, or other object whatsoever, without any respect had to the axis of the world, either projected or reflected. As also whether the glasse lie parallel to the horizon, or oblique unto it. Together with all necessary furniture belonging thereunto. All performed by an easie instrument fitted with lines to that purpose. By John Twysden, M.D.C.L