REPORTS OF ASTRONOMICAL OBSKRVAToRIKS. P.-^T 



iNSTRtraiENTS : 



(a) Meridian circles: 1. Transit circle by TuorcJUTOX & Simms ; one 

 movable imcl one lixed circle; diameter :HJ inches divided to 5"; 10 

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

 ing to r'-tenth by estimation; aperture of object-glass 8.59 indies; 

 61-inch collimators ; 2i-inch axle telescope. 2. Eeversing transit with 

 V's for meridian and prime vertical, by T. Cooke & Sons; 4 inch 

 object-glass. 3. Transit instrument by Trougutox & Snnis; 2-5 indi 

 object glass. 



{b) Meridian transit instruments: 1. Alt-azimuth, by Trougiiton & 

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

 zontal circles reading seconds and tenths by estimation. Horizontal 

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

 Aprs. 



(c) JEquatorialinstrwnents : One l.j.OO-inch refractor by Grurr. Sev- 

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

 solar eye-piece, 2, 3, 74 inch tinders. This telescope is controlled ;il)so- 

 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 

 Eev. H. Cooper Key English mounting. 3. One 12:^-inch reflector by 

 Browning. Solar spectroscope. 4. One 0.06-inch refractor by Si:mms ; 

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

 5. One 6.04inch refractor by T, Cooke & Sons. Complete. 6. One 

 4-inch refractor b}^ T. Cooke & Sons; bifllar micrometer. Clock by 

 EiCHENS. Comi)lete. 7. One 3-inch refractor by T. Cooke & Soxs ; 

 bifilar micrometer. Complete. 



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

 Eutherfurd prisms with reversion and heliometer viewing telescope. 

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

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

 spectroscope by Heustrell, and a variety of direct vision, cpiartz, 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 Auroras 



(e) Photometer: Zollner astro-photometer by Avsfeld of Gotha. 

 (/) Chronographs: 1. 4-fold barrel-chronograph, each barrel to^run 



6 hours, driven by the same clock as the 15.06-inch equatorial. 2. Port- 

 able fillet chronograph by Sie3IENS. 



{(j) CIocl's: 1. Sidereal clock, quicksilver compensation by Frodsiiam. 

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

 tric clock, outside dial and time gun. 



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

 time 3. J. Walker ; mean time. 4. Frodsiiam ; mean tune 8-day. 

 5. Walker; sidereal (electric contact). 6. Walker; sidereal. 7. 

 McLennan ; -jV seconds ; pocket M. T. 



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



