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sists of a west rotunda and three additions. It has double brick wallsand an air chamber with a space of 6 inches (0.15 m ) between the wallsInstruments :
(a) Meridian circle: Makers, Troughton & Simms; diameter ofcircle, 30 inches; divided to 5'; read by reading microscopes to 1', andmicrometers to single seconds; aperture of objective, 4 inches; mag-nifying power ordinarily employed, 120 diameters.
(e) Equatorial instrument: Makers,' Alvan Clark & SONS ; aper-ture of objective, 9.25 inches; magnifying powers of eye-pieces, 100 to1,200, 20 in number.
(d) Spectroscopes: Large 9-prism Clark spectroscope; seven prism,double acting (equivalent to 13 prisms), fitting equatorial mentionedabove.
(/) Chronograph : Bond’s spring governor.
( g ) Clocks: One mean time: makers, Utzschneider & Frauenhofer;connected with chronograph ; one sidereal; makers, Utzschneider &Mahler, of Munich ; connected with chronograph.
(i) Miscellaneous: Comet-seeker, aperture 3.6 inches, mounted onlarge tripod; small portable teleseope, aperture 3 inches; zenith sector,loaned by Coast Survey, aperture 4 inches; full set of common meteoro-logical apparatus, including a recording barometer; sextant by Hardy,of London .
Hastings, Hew York.
Private Observatory.
Longitude from Washington, 12“ 42.7“ E.
Latitude, 40° 59' 25"' K
Authority for longitude and latitude, U. S. Coast Survey.
Instruments:
(b) Meridian transit instrument: Makers, Stackpole & Brother;aperture, 2 inches; magnifying power, 45 diameters.
(e) Equatorial instruments: One reflector, 28 inches aperture, madeby Henry Draper ; {&) one refractor, 11 inches aperture, by AlvanClark & Sons, with photographic corrector.
(d) Spectroscopes: One diffraction, 1 stellar photographic, 1 automatic,etc.
(f) Chronograph : One made by Henry Draper .
(g) Clock: One mean time; maker, Howard.
(h) Chronometers: One mean time; maker, Negus : one sidereal;maker, Negus.
(i) Miscellaneous: Altitude and azimuth reflector of 15J inches aper-ture.