Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
1941
The following is a list of the principal features:
| Feature | Description |
|---------|-------------|
| BW | 3.05 |
| BT | 2.25 |
| BQ | 1.80 |
| BR | 0.70 |
| BS | 0.60 |
| BU | 0.50 |
There are several types of these devices:
- Type A: Used for [illegible]
- Type B: Used for [illegible]