Orbit of the spectroscopic binary [Alpha] Trianguli [microform]
Scanned microform pages catalogued as W. E. Harper's 1915 Dominion Observatory paper on the spectroscopic binary Alpha Trianguli, though the imaged leaves are a May 1850 Montreal supplement to the bookseller's catalogue of Édouard R. Fabre & Cie, listing French-language law and history titles for colonial buyers. The plates are letterpress: a centred title page in mixed display faces with an inked ownership signature, plus dense ruled entry lists and heavy black scan edges usable as type specimens and distressed borders.
![Picture 1 of 2 from Orbit of the spectroscopic binary [Alpha] Trianguli [microform] (1915), leaf 4](https://img.insideoutlibrary.com/img/200/ia-cihm_90855-4-0.webp)
![Picture 2 of 2 from Orbit of the spectroscopic binary [Alpha] Trianguli [microform] (1915), leaf 38](https://img.insideoutlibrary.com/img/200/ia-cihm_90855-38-0.webp)