| Object name: | Heliostat secondary mirror. |
| Maker: | Possibly the John A. Brashear Co., Allegheny PA. |
| Serial / Maker's No: | |
| Patent Date / Patent No / Date of Manufacture: | Similiar items were sold by the Brashear Co. around 1910. |
| Length: | |
| Width/Depth: | |
| Height: | 20-1/2 to 29" |
| Diameter: | The base has a 12" diameter footprint. |
| Weight: | 17.25 lbs. |
| Description: | Probably used for teaching purposes. The mirror measures 3/8" x 4-3/4" x 10" |
| References: | |
| Provenance: | |
| Inventory Number: | D4L |