This item is a wooden handheld Holmes style stereoscope with wooden hood and adjustable slide holder most likely manufactured by H.C. White Co. then retailed through Underwood & Underwood.

Written on object : The perfoscope. USA patented Oct 15 1859/Canada Feb 1 1896. DROM No. 53803

File consists of stereographs depicting various locations, buildings, and monuments in France and Martinique, such as scenery, and famous landmarks.

1 stereoscopic photograph by I.G. a Paris
1 stereoscopic photograph by N.C.
1 stereoscopic photograph by International Stereoscopic View Co.
1 stereoscopic photograph by Universal View Co.
1 stereoscopic photograph by B. W. Berry & Co.
1 stereoscopic photograph by Kilburn Brothers; 2 in association with James M. Davis
6 stereoscopic photographs by Strohmeyer & Wyman
6 stereoscopic photographs by J. F. Jarvis
7 stereoscopic photographs by Henri Guérard
3 stereoscopic photographs by Alex Fay
11 stereoscopic photographs by Underwood & Underwood
2 stereoscopic photographs by Universal Stereoscopic Co.
12 stereoscopic photographs by Keystone View Company
11 stereoscopic photographs by J.F.
11 stereoscopic photographs by B.K. Edit
7 stereoscopic photographs by Robinson
1 stereoscopic photograph by H.P.
1 stereoscopic photograph by CAM
1 stereoscopic photograph by Baptiste Guérard
1 stereoscopic photograph by M. Leon & J. Levy
1 stereoscopic photograph by Forsyth and Wlison
1 stereoscopic photograph by Henriot
2 stereoscopic photographs by A. Braun
2 stereoscopic photographs by G.A.F
1 stereoscopic photograph by W. England
1 stereoscopic photograph by H. C. White Co.
1 stereoscopic photograph by A. G. Berlin-Steglitz
79 stereoscopic photographs by unidentified publishers

File consists of stereographs depicting various locations, buildings, and monuments in India, such as the Taj Mahal and bodies of water.

9 stereoscopic photographs by Keystone View Co.
1 stereoscopic photograph by Kilburn Brothers; 6 in association with James M. Davis
1 stereoscopic photograph by H.C. White Co.
2 stereoscopic photographs by Underwood & Underwood
1 stereoscopic photography by an unidentified publisher

File consists of stereographs and stereographic sets depicting Scandinavian structures, famous locations, and scenery, such as lakes, bridges, waterfalls, and castles.

19 stereoscopic photographs by Keystone View Co.
1 stereoscopic photograph by Kilburn Brothers; 2 in association with James M. Davis
2 stereoscopic photographs by Universal View Co.
2 stereoscopic photographs by Strohmeyer & Wyman
9 stereoscopic photographs by Underwood & Underwood
2 stereoscopic photographs by J.F. Jarvis
1 stereoscopic photography by H.C. White Co.
1 stereoscopic photography by Art Nouveau (Platine) Stereograph
2 stereoscopic photographs by Quaker Oats Company
16 Stereoscopic photographs by unidentified publishers
2 series of stereoscopic photographs by Underwood & Underwood(1 on Sweden & 1 on Norway)

File consists of stereographs depicting structures, famous locations, and scenes in the Netherlands, such as hotels, docks, and the Hague.

6 stereoscopic photographs by Keystone View Co.
1 stereoscopic photograph by Kilburn Brothers, in association with James M. Davis
2 stereoscopic photographs by J.F. Jarvis
1 stereoscopic photograph by H.C. White Co.
1 stereoscopic photograph by J. J. Killelea & Co.
1 stereoscopic photograph by Universal Photo Art Co.
6 stereoscopic photographs by unidentified publishers

File consists of stereographs depicting various locations, buildings, and monuments in Russia, such as fountains, mountains, monuments, and the Peterhof Palace.

9 stereoscopic photographs by Keystone View Co.
9 stereoscopic photographs by J.F. Jarvis
2 stereoscopic photographs by Underwood & Underwood
2 stereoscopic photographs by H.C. White Co.
1 stereoscopic photograph by Kilburn Brothers, in association with James M. Davis
6 stereoscopic photographs by an unidentified publisher
1 series called "Japan and Russian Views" by an unidentified publisher

File consists of stereographs depicting structures and scenes from Greece and Turkey, such as temples and mosques.

4 stereoscopic photographs by Underwood & Underwood
6 stereoscopic photographs by Keystone View Co.
1 stereoscopic photograph by H.C. White Co.
1 stereoscopic photograph by E.J. Wardwell & Co.
7 stereoscopic photographs by unidentified publishers

File consists of stereographs and stereographic sets depicting scenes, famous location,s and structures from South America, such as theaters, docks, and cities.

8 stereoscopic photographs by Keystone View Co.
1 stereoscopic photograph by Underwood & Underwood
1 stereoscopic photograph by H. C. White Co.
1 stereoscopic photograph by an unidentified publisher
1 set of 15 stereoscopic photographs by Whiting View Co.

File consists of stereographs and stereographic sets depicting scenes, famous location,s and structures from the United States, such as bridges, parks, and mountains.

54 Stereoscopic photographs by Keystone View Co.
28 Stereoscopic photographs by F.J. Jarvis
16 Stereoscopic photographs by Strohmeyer & Wyman
47 Stereoscopic photographs by Underwood & Underwood
25 Stereoscopic photographs by Kilburn Brothers, 44 in association with James M. Davis
12 Stereoscopic photographs by H.C. White Co.
7 Stereoscopic photographs by C. Bierstdat
2 Stereoscopic photographs by Geo. Barker
7 Stereoscopic photographs by Stiff Bros.
15 Stereoscopic photographs by Caswell & Davy
4 Stereoscopic photographs by International Stereoscopic View Co.
4 Stereoscopic photographs by G. W. Pach
2 Stereoscopic photographs by G. F. Sproule
8 Stereoscopic photographs by Universal View Co.
2 Stereoscopic photographs by Robinson
3 Stereoscopic photographs by J.J. Reilly
3 Stereoscopic photographs by J. G. Rory
3 Stereoscopic photographs by Liberty Brand-Stereo Views
3 Stereoscopic photographs by The Whiting View Co.
3 Stereoscopic photographs by Jas. Esson
14 Stereoscopic photographs by E. & H. T. Anthony & Co.; 1 separately by E. Anthony
11 Stereoscopic photographs by L.E. Walker
2 Stereoscopic photographs by C.L. Pond
4 Stereoscopic photographs by A. L. Wiswell
2 Stereoscopic photographs by W. M. Chase
2 Stereoscopic photographs by B.C. Kinney
2 Stereoscopic photographs by C. W. Carter
4 Stereoscopic photographs by B. A. Crum & Son
7 Stereoscopic photographs by J. G. Parks
11 Stereoscopic photographs by J. J. Cook
2 Stereoscopic photographs by R. I. Seddons
7 Stereoscopic photographs by James Cremer
3 Stereoscopic photographs by W. G. Chamberlain & Sold by John B. Sisty, 2 sold separately by John B. Sisty
5 Stereoscopic photographs by Ketchum & Co.
3 Stereoscopic photographs by A. G. Grant
1 Stereoscopic photograph by J. W. & J. S. Moulton
1 Stereoscopic photograph by W. M. Notman
1 Stereoscopic photograph by W.D. Gates & Co.
2 Stereoscopic photographs by Woodward Stereoscopic Co.
1 Stereoscopic photograph by Illingworth & McLeish
1 Stereoscopic photograph by D. Barnum
1 Stereoscopic photograph by M.E. Brown
1 Stereoscopic photograph by H.S. Simon
5 Stereoscopic photographs by T.W. Ingersoll
1 Stereoscopic photograph by Ackermamn Bro's
1 Stereoscopic photograph by U.S. Stereoscopic Co.
5 Stereoscopic photographs by Webster & Albee
1 Stereoscopic photograph by A. Boisseau
2 Stereoscopic photographs by C.H. Shute & Son
1 Stereoscopic photograph by Moran & Storey
1 Stereoscopic photograph by W. H. Jacoby
1 Stereoscopic photograph by E. J. Wardwell & Co.
1 Stereoscopic photograph by Gates, R. R.
1 Stereoscopic photograph by Brubaker & Whitesides
1 Stereoscopic photograph by L. Parkinson
1 Stereoscopic photograph by Fay & Barney
1 Stereoscopic photograph by Alfred S. Campbell
1 Stereoscopic photograph by Richard Behrndt
1 Stereoscopic photograph by J. Carbutt
1 Stereoscopic photograph by Mayer & Cohen
1 Stereoscopic photograph by Boehl & Koenig
1 Stereoscopic photograph by Thomas Houseworth & Co.
1 Stereoscopic photograph by Charles A. Zimmerman
1 Stereoscopic photograph by W. R. Cross
4 Stereoscopic photographs by C. W. Woodward
1 Stereoscopic photograph by Universal Photo Art Co.
1 Stereoscopic photograph by Art Nouveau (Palentino) Stereograph
2 Stereoscopic photographs by Union View Co.
1 Stereoscopic photograph by Heywood
1 Stereoscopic photograph by John Moran
1 Stereoscopic photograph by Henry W. Osgood
1 Stereoscopic photograph by J. Loeffler
1 Stereoscopic photograph by John P. Soule
1 Stereoscopic photograph by H. H. Bennett
2 Stereoscopic photographs by William H. Rau
1 Stereoscopic photograph by J. A. W. Pittman
1 Stereoscopic photograph C. M. Marsh
2 Stereoscopic photographs by M. F. Bixby
1 Stereoscopic photograph by J. B. Linn
2 Stereoscopic photographs by Griffith & Griffith
2 Stereoscopic photographs by U. H. Patterson
1 Stereoscopic photograph by H. L. Toles View Co.
2 Stereoscopic photographs by L. D. & Co.
2 Stereoscopic photographs by J. N. Wilson & Co.
2 Stereoscopic photographs by B. F. Childs
1 Stereoscopic photograph by Hurd & Ward
1 Stereoscopic photograph by N. W. Pease
1 Stereoscopic photograph by North Western View Co.
1 Stereoscopic photograph by George Scripture
1 Stereoscopic photograph by C. K. Burns
1 Stereoscopic photograph by L. B. Curtis & Co's Camp
2 Stereoscopic photographs by Lovejoy & Foster
1 Stereoscopic photograph by T. G. Richardson
1 stereoscopic photograph by M. Rieder
15 Stereoscopic photographs by Rocky Mountain Curio Co.
11 Stereoscopic photographs by John Schedig & Co.
1 Stereoscopic photograph by A. C. Co
224 Stereoscopic photographs by unidentified publishers
1 series of stereocards by an unidentified publisher
2 series by Underwood & Underwood(1 specifically on Yosemite Valley)