The Instantaneous Wide Angle Lens only had four offered focal lengths, whereas the Wide Angle View Lens had ten.
References:
Scovill's Photo. Series No. 1, The Photographic
Amateur, 2nd Edition, J. Traill Taylor,
Scovill Mfg. Co. pub. (New York, NY), original copyright 1883,
2nd Ed. about 1885, ads p.
25
Descriptive Catalogue and Price List of the Photographic Apparatus
Manufactured by the American Optical Co., Scovill Mfg. Co.,
proprietors and managers (New York, NY), Sept. 1884, p.90
How to Make Photographs and Descriptive Price List,
Scovill Mfg. Co. (New York, NY), distributed by
Andrew J. Smith (Providence, RI),
1886, p. 53
Scovill's Photo. Series No. 20, Dry
Plate Making for Amateurs, Scovill Mfg. Co. (New
York, NY), 1886, ads p.
25
Scovill's Photo. Series No. 12, A Manual
of Photographic Chemistry, Scovill Mfg.
Co. (New York, NY), 1886, ads p.
33
How to Make Photographs and Descriptive Price List,
Scovill Mfg. Co. (New York, NY), distributed by
C.H. Codman & Co. (Boston, MA), April 1887, p.
49
The American Annual of Photography and Photographic Times Almanac for
1888, C.W. Canfield, ed.; Scovill Mfg. Co. (New York, NY), copyright
1887, ads p. 73
How to
Make Photographs and Descriptive Price List, Scovill Mfg. Co. (New
York, NY), November 1888, p. 44