422 a.stronomical observatories. 



Instruments: 

 («) Meridiem circles: 1. Transit circle by TROrGnTON & Simms; one 

 movable and one fixed circle; diameter 3G iuclies, divided to 5"; IG 

 microscopes (carried by 2 Alidade circles, 1 movable and 1 fixed), read- 

 ing to l"-tentli by estimation ; aperture of object-glass 8.59 inches ; 

 GJ -inch collimators 5 2^-inch axle telescope. 2. Eeversiug transit with 

 Vs for meridian and prime vertical, by T. Cooke & Sons; 4-inch ob- 

 ject-glass. 3. Transit instrument by Troughton & Simms; 2f-inch 

 object-glass. 



(b) Meridian transit instruments: 1. Alt-azimuth, by Troughton & 

 Simms ; 12-inch circles, divided to 5' ; 4 microscopes, vertical and hori- 

 zontal circles reading seconds and tenths b.y estimation. Ilorizontal 

 circle movable. 2. Theodolite by T. Cooke & Sons. 3. Theodolite by 

 Apps. 



(c) Equatorial i^istruments : One 15.06-inch refractor by Grubb. Sev- 

 eral sets of eye-pieces. Bifilar micrometer. Merz helioscope. Dawes 

 solar eye-piece, 2, 3, 74-inch finders. This telescope is controlled abso- 

 lutely by the sidereal clock. Driving-clock by T. Cooke & Sons, made 

 to special design. 2. One 12.9-inch reflector 122.5 focus ; mirror by 

 Kev. H. Cooper Key, English mounting. 3. One 12:|-inch reflector by 

 Browning. Solar spectroscope. 4. One G.OG-inch refractor by Simms; 

 bifilar and double image micrometers, used generally for comet seeking. 

 5. One G.04-inch refractor by T. Cooke & Sons; complete. 6. One 

 4inch refractor by T. Cooke & Sons; bifilar micrometer. Clock by 

 Eichens; complete. 7. One 3-ineh refractor by T. Cooke & Sons. 

 Bifilar micrometer; complete. 



{d) Spectroscopes: Large solar spectroscope with 1 whole and 2 half 

 EuTUERFURD prisms, with reversion and heliometer viewing telescope. 

 Stellar spectroscope modified at Dun Echt (the one most used). Brown- 

 ing 5-prism automatic solar spectroscope and 2 stellar ones; also Yogel 

 spectroscope by Heustrell, and a variety of direct vision, quartz, and 

 other prisms. Besides the above-mentioned spectroscope there is a 

 6-prism automatic reversing- table instrument by Browning, and a hand 

 direct-vision spectroscope used for aurorre. 



(e) Photometer ; Zollner astro-photometer by Ausfeld of Gotha. 



(/) Chronographs : 1. Four-fold barrel-chronograph, each barrel to run 

 six hours, driven by the same clock as the 15.0G inch equatorial. 2. 

 Portable fillet chronograph by Siemens. 



{(j) Clocls: 1. Sidereal clock, quicksilver compensation by Frodsham. 

 2. Mean-time clock, quicksilver compensation by MoLYNEUX. 3. Elec- 

 tric clock, outside dial and time gun. 



{h) Chronometers : 1. Kullberg ; mean time. 2. Farquhar; mean 

 time. 3. J. Walker; mean time. 4. Frodsham; mean time 8-day. 

 5. Walker ; sidereal (electric contact).. G. W^alker ; sidereal. 7. 

 McLennan; -*^^ seconds; pocket M.T. 



(i) Miscellaneous: 1. Metre: A copy of the Metre du Conservatoire. 



