Stereograph card: James & Annette Watson with telescope in front of the Detroit Observatory, ca. 1870

2 scans sharing same hs #, one with suffix 1of2 for full stereograph, 2of2 for crop to right side image only

Cyanotype of Detroit Observatory and Director's Residence, ca. 1900

2 scans sharing same hs #, one with suffix 1of2 for full stereograph, 2of2 for crop to right side image only

View of Detroit Observatory, ca. 1861 [note dog separate from man]

2 scans, 1of2 = entire page with inscription, 2of2 = image alone

Magnetical instructions for the use of portable instruments adapted for magnetical suverys and portable observatories, and for the use of a set of small instruments adapted for a fixed magnetical observatory;

Mode of access: Internet.