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period-searching techniques we take for granted today. His 1964 paper with Kam-Ching Leung (ApJ 139, 843) on the multiple periods of Delta
Delphini was the first published use of Fourier integral techniques to interpret stellar light curves. The quality and quantity of data (25 nights of three-colour photometry) and sophistication of the fit (a sum of 6 cosines) would not be out of place in the modern literature on asteroseismology of Delta Scuti variables (see his paper in these Proceedings). In the next decade, Bill again was a pioneer; this time in stellar surface imaging through inversion of spectral line-profile variations into abundance and temperature maps of Ap stars. Such techniques are now widely used to analyse high-degree NRP in rapid rotators. By the 1980s, Bill's diverse interests in pulsation and spectral peculiarity converged in the rapidly oscillating Ap stars. He played key roles in the first detection of velocity oscillations in an roAp (rotating Ap) star and in translating optical-IR photometry of roAp pulsations into the first empirical atmospheric temperature profile for a star other than the Sun."
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in 1962 and using data from the summer of 1960. In later work using data from this instrument, William Wehlau pioneered
Fourier techniques of detecting multiple periodicities in stars. The ground breaking work was the paper "The Multiple Periodicity of Delta Delphinii", Ap.J., Vol.139,April 1964, co-authored with graduate student Kam-Ching Leung.
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In 1960 a 300 mm (12") Cassegrain reflector (purchased in 1958) came online with a locally built photometer, and this combination of equipment supplanted the photometer on the refractor. The first published use was in the successful search for light variablility in the star HD 173650, published
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The important research work of
William H. Wehlau, staff, and students could not be summarized better than the obituary written by Bill's last graduating PhD student, Professor Jaymie Matthews, when he wrote, after Bill's sudden death in 1995, "Bill laid the foundation for many of the astronomical
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were presented to the university by the Arts Class of 1925, the first class to graduate from the newly finished
University College building. The tree and heliochronometer were originally placed on the northeast lawn of University College. The heliochronometer was subsequently moved in front of Cronyn
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This telescope was purchased by
William H. Wehlau in 1958 and was installed onto the refractor for the purpose of extending the photometric capabilities of the observatory. A new photometer was constructed and first deployed in 1960. The telescope has a 300 mm diameter parabolic mirror and has a
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The prime vision of this observatory was as an educational facility for the university and the local community. Since its inception, Cronyn
Observatory has held "public nights" for the community members, normally running every Saturday evening throughout the summer and currently also running twice a
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was first contracted to pour the glass for the objective lens, but because of the war effort was not able to fulfill its commitment. The best guess is that the lens was ground and polished by Halley Mogey (private family communication), the first employee of Perkin Elmer
Corporation and son of famed
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in 1969 the use of Cronyn
Observatory for research observing diminished. The last photometric observations published using Cronyn Observatory data was in 1995 in a paper by J. Bax, W.H. Wehlau and S. Sharpe. However, very active machine and electronics shops based in Cronyn Observatory supported
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at no extra charge, even though it was apparently not originally ordered. It is said that because of the war effort, Perkin Elmer was shifting its focus to military contracts and hence stopped its production of retail telescopes. The telescope is a classic
Schmidt camera, having a 203 mm
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with the idea of a memorial for her late husband. Mathematics and
Astronomy professor Harold Kingston suggested that the university was interested in building an astronomical observatory. The result was the construction a new $ 40,000 (equivalent to $ 885,070 in 2023) observatory on the
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diameter corrector plate, with a 300 mm diameter spherical mirror (an 8"/12" design). A small sliding door in the side of the instrument allows the loading of a circular piece of photographic film, mounted in a film holder. The provenance of this camera is presently unknown.
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The building is a stone structure, being 31 feet by 45 feet in horizontal dimension, made of Credit Valley Limestone, and trimmed with Indiana Sandstone. The building was designed by local architect O. Roy Moore, and built by the Putherbough Company. The dome was fabricated by
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by William and Amelia Wehlau, using data from 1957 and 1958. This combination of instruments was also used in the published search for variability in the stars Gamma Equulei and HD 149728, using 1958 and 1959 data from the refracting telescope.
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A locally modified Becker iris photometer was housed in the kitchenette in the basement of the observatory. In 1964 Amelia F. Wehlau discovered a 1938 nova while using this photometer to study photographic plates of
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and one science demonstration room. Since that time a 1967 Elginfield Observatory room as well as a William Colgrove historic workshop have been added. These are all open to the public during public events.
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While the observatory's prime vision was as an educational and outreach facility, some very important research publications came out of work done with the telescopes and other equipment at the observatory.
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The brass refractor telescope, finders, German equatorial mount, and pier were purchased from Perkin Elmer Corporation of New York for the sum of $ 7500 CDN. The objective is a crown and flint
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camera. He may well have had his hands on this particular instrument while he was a junior fellow at Harvard University at the time Perkin Elmer was founded in 1937 incorporated in Dec. 1939)
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to sell the instrument as the Pilkington-Gibbs Heliochronometer. About 1,000 were made. The instrument at Western is stamped No. 953. A cam device on the instrument takes into account the
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month throughout winter.. Large groups can also book a day or evening visit through the "Exploring the Stars Program", and finally private events for small groups are also available
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telescope maker William Mogey. The telescope tube is brass, having a focal length of 4386mm, which yields a speed of f/17.2. The telescope is fitted with 25mm and 90mm finders.
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A photometer was deployed on the 254 mm (10") refractor roughly between the years 1957 and 1960. The first research from this instrument was the study of the brightness of
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Observatory in 1952. After also being moved, the Ginkgo tree now thrives in its original location, turning a blazing yellow in about the first or second week of November.
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Building renovations of 1996 resulted in the replacement of the main floor foyer and two offices with a modern classroom that can seat approximately 70 people.
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For the celebration of the 75th anniversary in 2015, part of the basement of the observatory was converted into one 1940 historical
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university campus, funded by Mrs. Cronyn, and named in honour of her late husband. The grand opening was held on October 25, 1940.
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was a consultant for Perkin Elmer in 1940 in which year he developed his own version of the camera, to be known as the
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between the years 1932 and 1963. The nova was only found on the 1938 plates taken at the David Dunlap Observatory.
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applied for a patent for what he called a "Universal Equinoctial Mean Time Heliochronometer", basically a fancy
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focal length of 5232 mm, yielding a speed of f/17.2. The manufacturer of this instrument is not known.
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the research work of Elginfield Observatory until the 1.2m telescope at Elginfield was mothballed in 2010.
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died in 1933, his widow, Frances Amelia Cronyn (granddaughter of
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When local lawyer, businessman, and member of federal parliament
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in New York, shipped in pieces, and assembled on site.
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590:"The Opening of the Hume Cronyn Memorial Observatory"
1293:University and college buildings completed in 1940
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785:"Cronyn Observatory Exploring the Stars web page"
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401:. In the same year he formed a partnership with
1098:Ivey International Centre for Health Innovation
758:"Another look at the delta Scuti star FM Comae"
690:"A Servo System for Iris Diaphragm Photometers"
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1123:List of University of Western Ontario people
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707:"Probable Nova in the Globular Cluster M 14"
656:"The Multiple Periodicity of Delta Delphini"
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215:Location of Hume Cronyn Memorial Observatory
1102:Network in Canadian History and Environment
774:"Cronyn Observatory public nights web page"
673:"Obituary: William Henry Wehlau, 1926-1995"
16:Astronomical observatory in Ontario, Canada
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796:"Cronyn Observatory events web page"
756:Bax, J., Wehlau, W.H., Sharpe, S.,
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372:The 300 mm Cassegrain reflector
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142:Official Cronyn Observatory Website
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534:List of astronomical observatories
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483:Dominion Astrophysical Observatory
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835:The University of Western Ontario
654:Wehlau, W.H., Leung, Kam-Ching,
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25:Hume Cronyn Memorial Observatory
1298:1940 establishments in Ontario
1043:Physics and Astronomy Building
722:Wehlau, A., Wehlau, William,
416:This instrument, along with a
347:The 203 mm Schmidt camera
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1288:University of Western Ontario
883:Information and Media Studies
745:PASP Vol. 74, No.439, p. 286
694:PASP Vol. 75, No. 443, p. 188
677:Bulletin AAS Vol. 57, p. 1484
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260:University of Western Ontario
258:located on the campus of the
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1053:Spencer Engineering Building
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510:With the opening of the
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307:Perkin Elmer Corporation
256:astronomical observatory
232:Related media on Commons
473:that had been taken by
106:43.005583°N 81.275236°W
1058:Western Alumni Stadium
1023:Elginfield Observatory
512:Elginfield Observatory
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389:Gibbs Heliochronometer
381:Gibbs Heliochronometer
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44:Alternative names
1048:Saugeen–Maitland Hall
762:JRASC Vol. 89, p. 245
628:JRASC Vol. 53, p. 190
611:JRASC Vol. 51, p. 189
594:JRASC Vol. 34, p. 393
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111:43.005583; -81.275236
1033:Medway-Sydenham Hall
997:Western Mustang Band
945:St. Peter's Seminary
660:ApJ Vol. 139, p. 843
560:JRASC Vol. 34, p. 95
326:The purple refractor
184:Cassegrain reflector
1073:University Hospital
869:Arts and Humanities
358:James Gilbert Baker
102: /
47:Cronyn Observatory
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1157:: C$ 746.5 million
1068:University College
1018:Cronyn Observatory
739:Wehlau, William,
728:AJ Vol. 64, p. 463
711:AJ Vol. 69, p. 141
639:MacDonald, Rory,
495:Comet Arend-Roland
395:George James Gibbs
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362:Harvard University
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284:John Kinder Labatt
37:Cronyn Observatory
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1038:Middlesex College
588:Kingston, H.R.,
554:Kingston, H.R.,
475:Helen Sawyer Hogg
300:Building and dome
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280:Hume Blake Cronyn
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182:300 mm
171:203 mm
160:254 mm
57:Organization
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1231:Outer space
1219:Spaceflight
969:UWO Gazette
878:Engineering
439:period room
418:Ginkgo tree
130:Established
109: /
84:Coordinates
21:Observatory
1277:Categories
1006:Facilities
845:Located in
540:References
489:Photometry
471:Messier 14
403:Pilkington
313:Telescopes
295:Facilities
148:Telescopes
125:251 m
97:81°16′31″W
94:43°00′20″N
73:, Canada
1255:Education
1195:Astronomy
1155:Endowment
1013:Libraries
873:Education
858:Faculties
506:Post 1969
425:Classroom
162:refractor
1151:: 30,235
1149:Students
1087:Research
980:Football
923:Colleges
909:Business
528:See also
446:Research
122:Altitude
67:Location
1267:Science
1169:Portals
1143:Founded
963:CHRW-FM
956:Culture
930:Brescia
902:Science
888:program
399:sundial
274:History
138:Website
1183:Canada
1145:: 1878
1116:People
940:King's
764:, 1995
747:, 1962
730:, 1959
713:, 1964
696:, 1963
679:, 1995
662:, 1964
630:, 1959
613:, 1957
596:, 1940
562:, 1940
268:Canada
225:
71:London
1207:Stars
935:Huron
865:Music
262:, in
239:[
1094:CPSX
250:The
133:1940
898:Law
360:of
1279::
847::
760:,
743:,
726:,
709:,
692:,
675:,
658:,
647:^
626:,
609:,
592:,
581:^
567:^
558:,
547:^
413:.
270:.
266:,
1171::
826:e
819:t
812:v
243:]
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