plane table alidade with trough compass
Date1905-1907
Inventory Number5154
ClassificationAlidade
Subject
Maker
Bausch, Lomb, Saegmuller Company
1905 - 1907
Maker
Triple Alliance: Zeiss - Bausch & Lomb - Saegmuller
1908 - 1915
User
Department of Engineering Sciences, Harvard University
founded circa 1918
User
Lawrence Scientific School
1847 - 1906
Cultural Region
Place of Origin
DimensionsAlidade: 19.5 × 8.8 × 45.8 cm (7 11/16 × 3 7/16 × 18 1/16 in.)
case: 14 × 48 × 24.5 cm (5 1/2 × 18 7/8 × 9 5/8 in.)
case: 14 × 48 × 24.5 cm (5 1/2 × 18 7/8 × 9 5/8 in.)
Material
Accessoriesbubble level, sun shade, calibration card in lid, needle
DescriptionPlane table alidade with telescopic sight mounted on a column that also serves as a handle.
The telescope is flared and greenish in color. It is fitted with a horizontal silvered arc with vernier. A screw is mounted on the other side to adjust the angle. A bubble level (stored in the case) is designed to fit along the telescope. It has a spring-loaded clip to fasten it to the telescope.
The column that supports the telescope is covered in black leather.
The alidade base is fitted with a round bubble level and a trough compass. The trough compass has a needle brake. One long edge of the base is beveled. The brass is covered with black paint, which is bubbled up in places.
The fitted case stores the aforementioned bubble level, sun shade, and a needle mounted into a twig. The case is padded in places with chamois. It has spring-loaded latch hooks.
A paper label inside the case indicates that 1 division on the telescope level is equal to 60 seconds, and the stadia constant is 100.
The telescope is flared and greenish in color. It is fitted with a horizontal silvered arc with vernier. A screw is mounted on the other side to adjust the angle. A bubble level (stored in the case) is designed to fit along the telescope. It has a spring-loaded clip to fasten it to the telescope.
The column that supports the telescope is covered in black leather.
The alidade base is fitted with a round bubble level and a trough compass. The trough compass has a needle brake. One long edge of the base is beveled. The brass is covered with black paint, which is bubbled up in places.
The fitted case stores the aforementioned bubble level, sun shade, and a needle mounted into a twig. The case is padded in places with chamois. It has spring-loaded latch hooks.
A paper label inside the case indicates that 1 division on the telescope level is equal to 60 seconds, and the stadia constant is 100.
Signedon alidade base: Bausch, Lomb, Saegmuller Co. / ROCHESTER, N. Y.
on label inside case lid: Bausch & Lomb Optical Co. / [Triple Alliance logo surrounded by 6 cities] / ROCHESTER, N. Y.
in circle around logo on label inside case lid: BAUSCH & LOMB OPTICAL CO. - CARL ZEISS, JENA - G. N. SAEGMULLER-
prism logo: B-L / Z / S
Inscribedstamped on front edge of case lid and case top: 7
in white paint on front edge of lid: 7
in white paint on lower front right edge of case: B. L.
on metal label on case lid, front edge: HARVARD UNIVERSITY / 1713
stamped on lower front edge of case: ALIDADE / 7
serial number on alidade and on paper label in case: 2681
ProvenanceLawrence Scientific School; Harvard Department of Engineering; transfer to CHSI, 1961
W. & L. E. Gurley
Date: 1900-1906
Accessories: bubble level; plane table compass; case
Object number: 1997-1-1882
W. & L. E. Gurley
Date: 1900-1906
Accessories: dust cap; bubble level; plane table compass; needle in wood handle; case
Object number: 5155
Buff & Berger
Date: 1871-1898
Accessories: plane table compass; sun shade; dust cap
Object number: 5153
Keuffel & Esser Company
Accessories: bubble level, trough compass
Object number: 5156
C. F. Casella & Co. Ltd.
Date: circa 1920
Accessories: case
Object number: 1989-1-0028
Buff & Buff Manufacturing Company
Date: circa 1905
Accessories: wood case; leather case; right-angle prism; plumb bob; oil flask; tripod (5174b)
Object number: 5174a
W. & L. E. Gurley
Accessories: plane table compass; sunshade; case.
Object number: 1997-1-1883
Bausch, Lomb, Saegmuller Company
Date: 1905-1907
Accessories: screwdriver; key; dust cap; sunshade; carrying case; tripod (5162b)
Object number: 5162a
Andrew Yeates
Date: circa 1840
Accessories: case, second eyepiece, plumb bob
Object number: 5235
John H. Temple
Date: 1850-1870
Accessories: carrying case; dust cap; leather straps; tripod (5166b)
Object number: 5166a
W. & L. E. Gurley
Date: ca. 1884
Accessories: solar attachment; case; level; green filter; sun shade; tripod (5163b)
Object number: 5163a